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The advocate’s reasoning hinges on attributing improved air quality to the bus change. To strengthen, we need evidence ruling out rival causes. Choice C does exactly this by showing industrial emissions—the other major source of pollution—remained constant. With that factor stable, the most plausible cause of the improvement is indeed the bus replacement.

Choice A weakens, because the coal plant closure could explain the improvement instead. Choice B introduces measurement uncertainty, undermining the conclusion. Choice D points to another positive change (bicycling), but this competes as an alternative cause rather than confirming the bus link. Thus, C best strengthens the causal inference.

The researcher assumes causation between sleep and performance. Choice A introduces confounds—stress and diet—that could explain the higher scores. This weakens the causal claim.

Choice B is background context. Choice C is irrelevant to averages. Choice D describes napping but doesn’t challenge the main claim. LSAT weakening questions often hinge on rival causes—A is strongest.

The company infers causation (supplement → better recall). Choice B introduces a confounding variable—regular exercise—that is correlated with both group assignment and improved memory. If exercise explains the higher scores, the supplement’s effect is doubtful. This strikes at the causal link.

Choice A raises a design limitation but doesn’t directly explain away results. Choice C is irrelevant to memory outcomes. Choice D raises minor statistical concerns but doesn’t show why the supplement group performed better. LSAT weakening questions reward answers that show a plausible alternative cause; here, exercise provides one.

The passage reframes oral traditions as credible, valuable sources of history. Thus, B is the main conclusion.

Choices A, C, and D contradict the text. RC conclusion questions often require spotting the corrective stance—B is correct.

The passage presents both sides and concludes technology has dual, multifaceted effects. Thus, B is the correct answer.

Choices A and D are one-sided. Choice C is unsupported. RC main point questions often reward nuanced conclusions—B is correct.