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Problem 1 - Entrance Test

A recent study found that students who regularly consume energy drinks score 10% higher on standardized tests than those who do not. The study concluded that energy drinks enhance cognitive performance. Which of the following, if true, most weakens the argument?

Correct: B

The argument asserts a causal link: energy drinks enhance cognitive performance because students consuming them scored higher. Option B introduces an alternative cause (more study hours) for the higher scores, thereby weakening the claim that energy drinks are the direct cause. Option A discusses health problems, which is irrelevant to cognitive performance. Option C, while relevant, only suggests a lack of consistent evidence, whereas B provides a direct counter-explanation for the observed correlation in *this specific study*. Option D challenges the validity of standardized tests, which might weaken the *significance* of the scores but not the causal link *if* the scores are assumed to be a measure of 'performance'.