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Problem 9 - Entrance Test

A new report indicates that countries with higher per capita chocolate consumption also tend to have more Nobel laureates. Thus, eating more chocolate improves intelligence and creativity, leading to greater scientific achievement. Which of the following, if true, most weakens the argument?

Correct: C

The argument draws a direct causal link between chocolate consumption and intellectual achievement based on a correlation. Option C introduces a 'common cause' (wealth). If wealthier countries consume more chocolate *and* have better educational/research systems (which likely contribute to Nobel laureates), then wealth could be the underlying factor explaining both, thus undermining the direct causal link from chocolate to intelligence/creativity. This is a classic 'correlation does not equal causation' weakening strategy. Options A, B, and D are less relevant to the causal claim.