The main idea of the passage is to______.A．illustrate what enough sleep is through testsB．

The main idea of the passage is to______.

A．illustrate what enough sleep is through tests

B．explain that cognitive performance remains intact with less sleep

C．clarify that countermeasures can help to release sleepiness

D．demonstrate ways to make up for sleep deprivation

请帮忙给出正确答案和分析，谢谢！

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