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Choice A shows temporal evidence: productivity rose after the switch, supporting causation.

Choice B offers a rival cause. Choice C is general background. Choice D doesn’t weaken the average claim. LSAT strengthening questions often hinge on before-and-after changes—A is correct.

Choice A shows temporal sequence: arts funding rises → economies improve. This supports causation, rather than correlation.

Choice B and C suggest alternative explanations that weaken rather than strengthen. Choice D points to confounding factors (city size). Causal strengthening evidence must show timing or controlled conditions—A does so.

The economist assumes causation. For this to hold, it must not be true that economic growth itself explains renewable investment (reverse causation). Choice A states this assumption.

Choices B, C, and D are irrelevant. Assumption questions often hinge on ruling out rival or reverse causes—A is correct.

The scientist assumes the observed health benefits were due to antioxidants, not other diet changes. Choice D captures this assumption.

Choice A may be a possible rival explanation but is too narrow. Choice B and C are irrelevant. Assumption questions often hinge on eliminating rival causes—D is correct.

The spokesperson concludes superior battery life from customer self-reports of “fewest mid-day recharges.” That evidence may come from a non-representative group (brand enthusiasts, promo respondents), so the core flaw is reliance on a potentially biased sample to generalize to objective performance. Choice C states this explicitly. LSAT Logical Reasoning often tests the gap between anecdotal or selective data and general claims. Absent random sampling or controlled testing, the inference to “lasts longer than any competitor’s” is unjustified.

Choice A is off-point: the conclusion is already comparative (“longer than any competitor’s”), not absolute. Choice B (necessary vs. sufficient) doesn’t match the structure; the argument isn’t asserting that recharging mid-day is required for poor battery life. Choice D imports an unmentioned factor; while screen size could affect performance, the stimulus doesn’t ignore a known condition it earlier invoked. The more fundamental flaw is the leap from subjective, possibly skewed customer behavior to a universal performance claim. Recognizing sampling bias and representativeness is a key LSAT competency in evaluating evidence and argument strength.