54.
(B).
The passage concludes that increased leisure time in the developed
world causes an increase in the percentage of people diagnosed with clinical
depression. To arrive at this causal conclusion, the argument must assume that
alternative causes for this disparity are impossible.
(A) This statement weakens the hypothesis. If clinical depression were
genetically transmitted, then the amount of leisure time would have no effect
on the percentage of the population diagnosed with clinical depression.
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