How does the presence of observers affect a person's performance?A. It improves performance on easy tasks and hinders a person's performance on difficult tasksB. It improves performance on verbal tasks and hinders a person's performance on mathematical tasksC. It improves performance on poorly learned tasks and hinders a person's performance on well-learned tasksD. It improves performance on unenjoyable tasks and hinders a person's performance on enjoyable tasksE. It improves performance on physical tasks and hinders a person's performance on mental tasks

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