Nearly 300 studies confirm that social arousal ___________ performance on easy tasks and __________ performance on difficult tasks.

Question

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The question is asking about the effects of social arousal on performance. According to the passage, social arousal boosts performance on easy tasks and hurts performance on difficult tasks. Therefore, the best choice is C: boosts; hurts.

Nearly 300 Studies Confirm That Social Arousal ___________ Performance on Easy