CAT 2021 VARC Questions — Slot 3

A main-idea answer must capture the whole arc of the passage, not just one true detail — so trace the argument end to end before choosing.

What the passage actually does

The passage is not really about "discovering" a hidden part of the mind. It is about how a new term — "the unconscious" — gathered together many separate fields and practices that had not previously been grouped.

The key lines come early: once coined, powerful new ideas "attracted to themselves a whole host of seemingly unrelated issues, practices, and experiences, creating a peculiar network of preoccupations that as a group had not existed before." The author then lists spiritualists, psychiatrists, surgeons using hypnotism, magnetizers, physiologists, neurologists, philosophers, and psychologists — all pulled toward the same idea.

Later, Hartmann's 1869 introduction of the term "appeared to focalize many stray thoughts," again showing the same movement: scattered ideas being collected under one label.

Why C is correct

Option C — "The collating of diverse ideas under the single term: unconscious" — names exactly that throughline. The passage's spine is the assembling of many unrelated strands under one new concept.

Why the others fail

• A frames the passage as the "discovery" of a part of the mind. But the author is tracing how a concept/term organized many fields, not the discovery of a mental organ — too narrow and slightly off.
• B mentions the "growing vocabulary of the soul and the mind," which the passage does note, but only as a supporting detail, not the central thrust.
• D singles out psychical research, but that is only one of many practices listed among those drawn in — far too narrow.

Answer: C

This is a sentence-paraphrase question — the key is getting the direction of causation right.

Read the sentence carefully

"The enrichments of literary and intellectual language led to an altered understanding of the meanings that underlie time-honored expressions and traditional catchwords."

Break it into cause and effect:

• Cause: the enrichments (innovations) of literary and intellectual language
• Effect: an altered understanding of the meanings underlying time-honored expressions

So the innovations in literary/intellectual language changed how people understood older, established expressions.

Why D is correct

Option D says: "The meanings of time-honored expressions were changed by innovations in literary and intellectual language." That preserves both the direction and the content of the original sentence.

Why the others fail

• B reverses the direction: it says the time-honored expressions enriched literary language — the opposite of what the sentence states.
• C also reverses direction: it says literary language was altered by the time-honored expressions.
• A ("all of the options") is impossible, since B and C are both backwards.

Answer: D

Pick the three words that trace the argument's spine, not its minor examples — so look for the overall movement, not isolated details from the long list of practices.

Trace the passage's three-stage arc

1. First, the vocabulary/language concerning the soul and mind "increased enormously in the course of the nineteenth century."
2. Then, the new concept of the unconscious was coined and pulled in diverse ideas and practices.
3. Finally, it "became fixed and defined in specialized terms within the realm of medical psychology and Freudian psychoanalysis."

So the argument moves: Language → Unconscious → Psychoanalysis.

Why C is correct

Option C — "Language; Unconscious; Psychoanalysis" — maps that arc exactly, capturing the beginning, middle, and end of the passage's argument.

Why the others fail

• A includes "Dreams," which is only one narrow example from the list of phenomena physicians puzzled over.
• B includes "Insanity," again just one example among many practices.
• D includes "Magnetism" and "Psychiatry," both narrow items from the catalogue, not the overall movement.

None of these captures the passage's progression from language to the concept to psychoanalysis.

Answer: C

This is an EXCEPT question — find the one inference that is not supported by the passage.

Check each option against the text

Option C claims: new nineteenth-century conceptions "could provide new knowledge because of the establishment of fields such as anaesthesiology."

The passage only mentions "anesthesia" as one phenomenon that a physician "puzzled over" — it never says anaesthesiology was established as a field, nor that such establishment caused new knowledge to flow from new conceptions. In fact, Hartmann's attempt at defining the unconscious "proved fruitless." The causal chain in C is simply not in the passage.

💡 Teacher tip: Watch for options that take a passing detail and turn it into a cause. The passage lists anesthesia as a topic of puzzlement, not as a source of new knowledge.

Why the others are valid inferences (so not the exception)

• A: The passage says the enrichments of language "led to an altered understanding" of the soul and mind. So it is reasonable to infer that without those linguistic developments, the growth of understanding might not have happened.
• B: The passage dates the connection between creative genius and insanity to this period — before 1790 "few if any spoke, in medical terms, of the affinity between creative genius and the hallucinations of the insane," and many of these practices "originated in the waning years of the eighteenth century."
• D: Directly supported: powerful new ideas "attracted to themselves a whole host of seemingly unrelated issues, practices, and experiences," so previously unrelated practices came to be treated as related.

Since C is the one inference the passage does not support, it is the exception.

Answer: C

A summary question with a clear two-part structure: a widely-felt improvement and a persistent unfairness. The right option must hold both.

What the passage says. Most Brazilians feel better off — incomes are rising fast, unemployment is low, inequality is falling, the middle class is growing. But the economy is still "painfully unequal": the poor pay the biggest share of their income in taxes and get the least back in services.

Why C is correct. "Most Brazilians feel they have benefitted from recent economic events, but the poor continue to be dealt unfairly by the state." It holds the felt improvement and the unfair treatment of the poor side by side — exactly as the passage does.

Why the others fail.

• A says "rising inequalities." The passage says inequality is falling; the real problem is unfair taxes and services, not rising inequality.
• B predicts the situation is "likely to destabilise the Brazilian economy in the next few years" — a forecast the passage never makes.
• D says people are "misled into thinking that their economy is doing well." But they have genuinely benefitted from rising incomes; they aren't being fooled.

Answer: C

This is a para-jumble. The way in is to find the sentence that can only open — one that introduces the topic without pointing back to anything — and then follow the chain of back-references from there.

The opener is 2. "Relationships are nothing without the communication that brings them into being... scholars should attend to relational histories in their analyses." It sets up the topic and puts two ideas on the table — communication (discourse) and relational histories (history) — while referring back to nothing before it. That makes it the natural start.

3 follows 2. Sentence 3 says a Foucauldian approach "goes beyond these conceptions of discourse and history." The words "these conceptions of discourse and history" have to point at something already named — and discourse and history are exactly what sentence 2 just introduced. So 3 must sit right after 2.

1 follows 3. Sentence 3 brings in a new term, "regimes of truth." Sentence 1 then explains that very term: "It is regimes of truth that make certain relationships speakable." A sentence that defines an idea belongs immediately after the sentence that first names it.

4 closes. Sentence 4 pulls the whole thread together — "micropractices within relationships that are constituted within and simultaneously contributors to regimes of truth" and the "central position of power/knowledge." It is a summing-up sentence, so it lands last.

Reading it straight through: a communication-and-history view of relationships → a Foucauldian approach that goes beyond it to regimes of truth → what regimes of truth actually do → and finally the role of power/knowledge. The order is smooth and complete.

💡 Teacher tip: In a jumble, a demonstrative like "these" or "this" is a gift — it must attach to a noun already mentioned, so it instantly fixes which sentence comes just before.

Answer: 2314

A paragraph-sense question asks you to capture who is who and what happens in that paragraph — not to import facts from elsewhere.

What paragraph 1 actually says.

The opening tells us that the X-Men are "our mutant heroes" — the protagonists. They had already been fighting giant robots called Sentinels, and now those overlords "spawned a new threat: Nano-Sentinels" — tiny robots that invade human bodies "at the microscopic level" and convert infected humans "into machines, cell by cell."

So the sense is: mutant heroes (the X-Men) face a new, tiny robotic enemy (Nano-Sentinels).

Why D is correct.

Option D restates exactly that relationship: the X-Men are the mutant heroes, and they now battle tiny robots called Nano-Sentinels. It keeps the roles intact and names the new threat correctly.

Why the others fail.

• A swaps the outcome: infected humans were "converted into machines," not into X-Men. The X-Men are the heroes, not the product of infection.
• B reverses the roles: it was the Nano-Sentinels that infected people, not the X-Men. The X-Men fight the threat; they do not cause it.
• C ("none of the options") is unnecessary, because D accurately captures the paragraph.

Answer: D

This is a negation question, so slow down and decode the logic first. "Which scenario, if false, could be seen as supporting the passage?" means: find the scenario whose opposite is what the passage claims — i.e., the scenario that contradicts the passage. If that scenario is false, the passage is upheld.

So we are looking for the option the passage would disagree with.

Why D is correct.

The passage explicitly denies the comic-book fate: "No, they won't be invading our bodies and turning us into Sentinels." Instead, some robots "could one day swim through our bloodstream to heal us." So the passage rejects the idea of converting people into machines.

Option D asserts exactly that rejected idea — robots "used to inject people to convert them into robots, cell by cell." If D is false (they will not convert people), that matches what the passage says, and so supports it.

Why the others fail.

The passage actually supports A, B, and C. So if any of them were false, it would contradict the passage, not support it.

Only D, when negated, lines up with the passage.

Answer: D

An "extension" question asks which new statement, if true, follows most naturally from the passage's own logic and emphasis — not just any plausible sci-fi idea.

What the passage keeps emphasising.

The forward-looking thread is medical and internal-to-the-body. The author says some tiny soft robots "could one day swim through our bloodstream to heal us," and later repeats the keen interest in "nanometre-scale 'soft robots' that could one day swim through our bodies." The research by Metin Sitti — tiny magnetic devices guided through tubes of fluid — points the same way.

Why C is correct.

Option C — robots used to "search and destroy diseases even in the deepest recesses of the human body" — is the most direct extension of that healing-inside-the-body idea. It takes the passage's stated medical promise and carries it one natural step forward.

Why the others fail.

• A (warfare, destructive mutations among civilians) runs against the passage's healing emphasis and its explicit denial that robots will turn us into Sentinels.
• B (creating X-Men by injecting mutant nano-gels) revives the comic fiction the passage deliberately distances itself from ("No, they won't be invading our bodies and turning us into Sentinels").
• D (1-cm blobs sending messages) is unsupported: the passage says these blobs "can skate over water," not that they carry messages.

Answer: C

A central-point answer must capture the whole arc of the passage, not one vivid detail — so trace the argument from start to finish.

The spine of the passage.

It opens in a science-fiction register — X-Men comics, Nano-Sentinels invading human bodies. Then it pivots with the key sentence: "Now, a new wave of extremely odd robots is making at least part of the Nano-Sentinels story come true." From there, the author surveys real research: hydrogel blobs that skate on water, self-rolling sheets, magnetic soft robots guided through fluid tubes. The movement is clearly from comic-book fiction to actual scientific research.

Why C is correct.

Option C — "Once the stuff of science fiction, nano-robots now feature in cutting-edge scientific research" — captures that entire arc in one sentence. It names both endpoints (fiction → research) and leaves out nothing essential.

Why the others fail.

• A (sticky feet, walls/ceilings) is a narrow supporting detail about one hydrogel application; it cannot carry the whole passage.
• B ("have become increasingly useful") overstates the present. The passage is careful to say these devices "could one day" heal, clean, or fold into vehicles — it is about future potential, not current usefulness.
• D (robotics featured more in comics) reverses the direction. The point is real research realising comic-book ideas — not comics featuring more robotics.

Answer: C

A summary question. The passage makes one central claim with two linked parts, and the right option must restate both.

What the passage says. Intuition is not the opposite of data. The mind subconsciously spots patterns and fires neurochemicals — "somatic markers" — that give us an instant sense of right or wrong. And it draws on a vast store of past experience, which makes it faster than rational thought and richer than big data alone.

Why D is correct. "Intuitions are neuro-chemical firings based on pattern recognition and draw upon a rich and vast database of experiences." That captures both halves — the neurochemical, pattern-spotting mechanism and the deep well of experience it draws on.

Why the others fail.

• A overstates: "infinitely richer" and "accomplishes more than... big data" push well past what the passage claims.
• B claims decisions based on intuition are "better." The passage says intuition is faster — not that its decisions are better.
• C says intuition "may not be related to data." That reverses the passage, which insists "intuitive decisions are based on data, and not contrary to data."

Answer: D

This is an odd-one-out. Find the single idea that ties four of the sentences into one paragraph, then spot the sentence that is about something else.

The thread that unites four sentences is gender inequality in the technology sector, and how technology carries the values of the people who build it.

• Sentence 3 states the problem: tech is male-dominated, and "technology designs embody the values of their makers."
• Sentence 5 gives the mechanism: if technology "merely reflects the perspectives of the male stereotype," it won't fit diverse users.
• Sentence 1 offers a concrete example: Wikipedia's mostly-male contributors skew its content.
• Sentence 2 states the consequence: without diverse representation, society gets "a distorted picture of future options" that widens inequality.

Together these four move cleanly from problem → mechanism → example → consequence, all about technology.

The odd one is 4. It talks about "unequal representation in the workplace" and "structural inequalities embedded within the current organisation of work and employment." That is a point about employment and the workplace in general — not about technology or designs embodying their makers' values. It sits on a different subject, so it breaks the thread.

Answer: 4

A para-jumble. Find the sentence that can only open, then let two link-words — "This" and "Legal hurdles notwithstanding" — lock the rest into place.

The opener is 3. "Museums in Europe today are struggling to come to terms with their colonial legacy, some taking steps to return artefacts but not wanting to lose their prized collections." It sets the scene broadly and refers back to nothing, so it starts.

2 follows 3. Sentence 2 begins "This is in response to countries like Nigeria, which are pressurising European museums to return their... artefacts." The word "This" points back to the steps-to-return just described in 3.

1 follows 2. Now the complication appears: restitution "could face legal obstacles, as many Western museums are legally prohibited from disposing off their collections." The pressure is established, and the obstacle answers it.

4 closes. "Legal hurdles notwithstanding, politicians and institutions in France and Germany would now like to defuse the colonial time bombs..." The phrase "Legal hurdles" reaches straight back to the legal obstacles in 1 and then resolves them.

Read in order: museums grapple with their colonial legacy → driven by pressure from countries like Nigeria → but restitution runs into legal obstacles → yet, despite those hurdles, France and Germany back partial returns. Coherent and complete.

Answer: 3214

This is an odd-one-out. Name the subject four sentences share, then find the sentence about a different subject.

The shared subject is the best Chinese business schools and how they are growing distinct.

• Sentence 2 opens it: these schools "look like their Western rivals but are now growing distinct in terms of what they teach and the career boost they offer."
• Sentence 5 continues: "Their business courses now largely cater to... China Inc."
• Sentence 1 adds detail: "They often include a foundation course on navigating capitalism with Chinese characteristics" and focus on China's local firms.
• Sentence 4 adds the draw for students: "the chance to rub shoulders with captains of China's private sector."

Notice how "their" and "they" in 5, 1 and 4 all chain back to the Chinese schools named in 2. Four sentences, one subject.

The odd one is 3. It is about Western schools: "Western schools have enhanced their offerings with double degrees... and boosted the prestige of their Chinese partners." The subject has switched to Western institutions, so it doesn't belong.

💡 Teacher tip: When every sentence but one shares the same pronoun chain ("their/they" = the Chinese schools), the sentence that starts a new subject noun is usually your odd one.

Answer: 3

Let's build this paragraph step by step by finding the sentence that can open, then following the logical thread from one sentence to the next.

Step 1 — Find the opener. Sentence 3 is the natural opener: "For years politicians have promised workers that they would bring back their jobs by clamping down on trade, offshoring and immigration." It is broad, self-contained, and introduces the background situation without referring back to anything. None of the other sentences can start the paragraph comfortably — 4 contrasts with a prior claim, 1 explains a term already in play, and 2 opens with "But," which demands a preceding statement.

Step 2 — What follows the politicians' promise? Sentence 4 directly counters the politicians' framing: "Economists, based on their research, say that the bigger threat to jobs now is not globalisation but automation." The phrase "not globalisation but automation" is a direct rebuttal of the trade/offshoring blame in sentence 3. So 3 → 4.

Step 3 — Why is automation the threat? Sentence 4 has just named automation as the real danger. Sentence 1 then explains why automation is spreading so aggressively: "Businesses find automation, such as robotic employees, a big asset in terms of productivity and efficiency." The word "automation" links 4 to 1, and 1 supplies the motive behind the threat. So 4 → 1.

Step 4 — Close with the widening damage. Sentence 2 opens with "But", signalling a turn. Up to this point we have heard why businesses want automation; sentence 2 now reveals the cost — and notes that the damage is spreading: "not just… manual labour" but now "white-collar and service-sector work" too. This escalation is the natural closing note. So 1 → 2.

Reading the full paragraph (3-4-1-2): Politicians blamed trade for job losses → economists say the real threat is automation → businesses eagerly adopt it for productivity → but the resulting unemployment is climbing the skill ladder.

The thread is tight: a claim, its rebuttal, the mechanism behind the rebuttal, and the consequence.

Answer: 3412

Framing: This asks for the author's overall stance on Pinker's book — so trace the one move the author makes at the end, where a possible objection is raised and then dismissed.

The passage builds Pinker's case — language is innate, wired into the brain, rooted in Darwinian evolution and genes. Then the author pauses to admit a worry: this biological framing "might seem to invite the twin bugaboos of biological determinism and racism." But the author immediately shows how Pinker defuses that fear: all 4,000–6,000 languages "are all sufficiently alike," cultural diversity is "superficial and minor compared to the similarities," and "racial differences are literally only 'skin deep.'" The closing line makes the fundamental unity of humanity the theme of the book.

So the author's position is that the universality of the language instinct counters the racism charge — exactly option D.

Why the others fail

• A states the opposite of Pinker's view. The passage says his proposition "apparently contradicts the liberal idea that human behavior may be changed for the better by improvements in culture and environment." Culture and environment are precisely what Pinker downplays, not champions.
• B is explicitly rejected. The passage says, "It is not that chimps lack the vocal apparatus to speak; it is just that their brains are unable to produce or use grammar." Anatomy is ruled out as the deciding factor.
• C reverses the author's position. The author says the framework might seem to invite racism but that universality dispels it — not that the book actually "makes it racist."

Answer: D

Framing: An EXCEPT question — find the one statement that is not true of the language instinct.

The key line is about chimps. The passage says Pinker "effectively disposes of all claims that intelligent nonhuman primates like chimps have any abilities to learn and use language," because "their brains are unable to produce or use grammar." So intelligent primates such as chimps do not have the language instinct.

Option A — "all intelligent primates are gifted with it" — directly contradicts this. That makes A the exception.

Why the others are true (so not the exception)

• B: The passage says a half-century ago the idea would have been dismissed as a "black box" theory because the grammatical faculty could not be pinpointed, but "now things are different" — neurosurgeons have found it "situated in and around Broca's area." Neuroscience has increased acceptance.
• C: The passage says the instinct, when it first appeared, "must have given them a selective reproductive advantage over their competitors."
• D: This is simply the correct negation of A — chimps, which are intelligent primates, lack it.

Answer: A

Framing: Find the single point on which the passage explicitly marks a divergence between Pinker and Chomsky.

The passage states it outright: "Unlike Mr. Chomsky, Mr. Pinker firmly places the wiring of the brain for language within the framework of Darwinian natural selection and evolution." So Pinker invokes Darwinian evolution; Chomsky does not. They disagree on the Darwinian explanatory paradigm — option C.

Why the others fail

• A (the language instinct): This is the shared doctrine of both. The passage opens by attributing the innateness idea to Chomsky and then says Pinker has "brought Mr. Chomsky's findings to everyman." It is common ground, not a disagreement.
• B (inborn human language acquisition): Both agree language is innate — the passage says language "was innate" and the grammatical faculty was "built into the infant brain." No divergence here.
• D (universal grammar): "Universal grammar" is literally "what Mr. Chomsky calls," and both subscribe to it. The closing line ties "the fundamental unity of humanity" to "Mr. Chomsky's universal grammar, and of this exciting book" — Pinker's book shares the theme.

Answer: C

Framing: Another EXCEPT — which statement is not true of Pinker's book.

The passage says Pinker's proposition "will undoubtedly raise the hackles of some behavioral psychologists and anthropologists, for it apparently contradicts the liberal idea that human behavior may be changed for the better by improvements in culture and environment." Pinker's stance contradicts behavioral psychology — he does not draw from it. Option C claims he does, so C is the exception.

💡 Teacher tip: Watch the direction of the relationship. A theory can be mentioned in a passage because the author opposes it — that is not the same as the book "drawing from" it.

Why the others are true (so not the exception)

• A: Pinker "has brought Mr. Chomsky's findings to everyman" — he draws extensively on Chomsky's propositions.
• B: "When he disagrees with Mr. Chomsky he tells you so" — for example, on Darwinian evolution. He does disagree on certain grounds.
• D: Chomsky's discourse is "so opaque that it was nearly incomprehensible even to some scholars," whereas Pinker's book is "brilliant, witty and altogether satisfying" and "brought... to everyman." Clearly a different, more accessible style.

Answer: C

Framing: An EXCEPT question flipped on its head — three of the four statements cannot be inferred; only one can. So confirm the single inferable statement and reject the three that overreach or distort.

Why B is the one we can infer.

Near the end, the passage says understanding the accuracy–entropy relationship "could be helpful for designing clocks in the future, particularly those used in quantum computers and other devices where both accuracy and temperature are crucial."

Chain that together with the core finding from earlier in the passage: as a clock's accuracy increases, the heat it produces grows, increasing entropy. So if quantum computers need highly accurate clocks, and greater accuracy means more heat and entropy, then quantum computers are likely to produce more heat and entropy because of that emphasis on accuracy. That is exactly option B.

Why the others fail.

• A: The passage says what is not yet tested for atomic clocks is the accuracy–entropy relationship ("it's still unclear how this principle plays out in real devices such as atomic clocks"). It does not say the "arrow of time" is untested for atomic clocks. A conflates two different ideas from different parts of the passage.

• C: The passage explicitly warns against the reverse inference. The grandfather-clock example shows that a clock can generate a lot of entropy without being accurate — "a large, inefficient grandfather clock isn't more precise than an atomic clock." So "less accurate → less entropy" does not follow.

• D: This reverses the causation. The passage says the membrane was "vibrated by an electric current" — the current drives the vibration; the vibrating membrane does not produce the current.

Answer: B

Framing: An EXCEPT question — find the one statement the author does not argue. Confirm the three the passage supports; the leftover is the answer.

Two options are clearly supported.

• A matches the author's own caution near the end: "We can't be sure yet that these results are actually universal... because there are many types of clocks for which the relationship between accuracy and entropy haven't been tested." That is precisely the claim that the relationship may not apply to all clocks. Supported — not our answer.

• D matches the next sentence: understanding the link "could be helpful for designing clocks in the future, particularly those used in quantum computers... where both accuracy and temperature are crucial." Precision and heat, weighed together, for quantum-computer clocks. Supported — not our answer.

That leaves B and C, and both wobble.

• B says the heat produced is "the price paid" for increased accuracy. But look at how Ares frames the price: "you pay for it by pouring more ordered energy into the clock, which is then converted into entropy." What you spend is ordered energy; the heat and entropy are what that energy is turned into afterwards. B swaps the by-product for the payment.

• C says there is "no difference in accuracy" between an inefficient grandfather clock and an atomic clock. The passage only says the grandfather clock "isn't more precise than" an atomic clock — which means at best equal, possibly worse. And a later line notes atomic clocks "push the ultimate quantum limits of accuracy," suggesting the atomic clock is in fact the more accurate one. C turns "not more precise" into "exactly equal."

Both B and C misread the passage, so either can be defended as the EXCEPT. The official key is B. A careful reader could also reject C, since its distortion is the tidier one — it flattens "not more precise" into "no difference" in a single line. If you are matching the official key, mark B; but choosing C was not a mistake.

💡 Teacher tip: An option can go wrong by overstating the text (C turns "not more precise" into "no difference") or by shifting a relationship (B turns the by-product into the price). When two options slip by comparable amounts, the fault lies with the question, not with you.

Answer: B

Framing: Read the logic of the analogy, not its surface. The quote says, "Just because I'm using more fuel doesn't mean that I'm going faster or further."

Why A is correct.

The analogy sets up a one-way relationship:

• Going faster tends to use more fuel — the forward direction holds.
• Using more fuel does not mean going faster — the converse fails.

Huber uses this to clarify the clock finding: more accuracy produces more entropy (forward holds), but more entropy does not mean more accuracy (converse fails). That is why "a large, inefficient grandfather clock isn't more precise than an atomic clock" — it may generate plenty of entropy without being accurate. Option A states exactly this logic.

Why the others fail.

• B: A non-sequitur about "time used" that has nothing to do with the analogy's point.

• C: Irrelevant — measuring a car's speed with different clocks is beside the point entirely.

• D: This traces the forward chain (faster/further → more fuel → more heat → more entropy) but misses the point of the analogy, which is that the converse breaks down. Stating the forward direction alone is not what the example was built to show.

Answer: A

Framing: Keywords should name the passage's recurring spine, not its incidental details. Ask: what does this passage keep coming back to?

Why C is correct.

The passage is fundamentally about measuring time (clocks, ticking), the accuracy of those clocks, and the entropy they produce. The opening sentence frames all three at once: "Keeping time accurately comes with a price... directly related to how much disorder, or entropy, it creates every time it ticks." These three concepts recur throughout — in the experiment, in the arrow-of-time discussion, in the quantum-clock comparison, and in the design implications. Option C captures that spine.

Why the others fail.

• A (Electric current; Heat; Quantum effects): Led by experimental details and one comparison; misses the central accuracy–timekeeping thread.

• B (Silicon Nitride; Energy; Grandfather Clock): Two narrow details (the membrane material, one example clock) plus a broad term; not the conceptual core.

• D (Membrane; Arrow of time; Entropy): "Membrane" is a single experimental detail; "arrow of time" is one tangential discussion. Only "entropy" is central here.

Answer: C

This is a summary question, and the passage clearly has two sides. A correct summary must carry both — miss one and it fails.

What the passage says. People treat idleness as a sin and hard work as a virtue, and this has pushed many into jobs they find meaningless and into constant busyness — that's the cost. But the "opposing view" is that hard work has brought prosperity, better health and education, and labour-saving innovation — that's the benefit.

Why D is correct. "While the idealisation of hard work has propelled people into meaningless jobs and endless activity, it has also led to tremendous social benefits from prosperity and innovation." The "while... it has also" structure holds the cost and the benefit — exactly the balance the passage strikes.

Why the others fail.

• A keeps only the benefits and brushes the criticism aside as coming from mere "detractors." One-sided.
• B adds advice the passage never gives — that people should "reserve their leisure time for some idleness."
• C says hard work "led to greater idleness," which flips the passage on its head; the passage says people stay endlessly busy and treat idleness as a sin.

Answer: D