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The critic argues that optimizing for watch-time causally leads to narrowed exposure; recommendations purportedly broaden horizons but in practice do the opposite. The best support would demonstrate that changing the optimization objective from watch-time to something like diversity causally changes outcomes in the predicted direction. Choice B does exactly that: when the platform explicitly optimizes for discovery diversity, exposure broadens even if watch-time decreases. This shows that the chosen objective function—watch-time—drives the system toward familiar content, strengthening the critic’s causal link.

Choice A weakens rather than strengthens, suggesting recommendations may not govern behavior. Choice C is neutral; reliance on demographics does not show narrowing. Choice D points to editor curation that might expand exposure, which undermines the general claim. LSAT strengthening questions reward evidence that ties the mechanism to the outcome; B connects objective function to exposure breadth and thus strongly corroborates the critic’s thesis.