Passage: In a national health survey, adults who reported sleeping fewer than six hours per night were twice as likely to report chronic fatigue and 40% more likely to report depressive symptoms compared to those sleeping seven to nine hours. Which conclusion is most defensible?
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A
Sleeping fewer than six hours is associated with higher rates of fatigue and depressive symptoms.
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B
Depression causes people to sleep fewer than six hours every night.
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C
All adults who sleep less than six hours will develop chronic fatigue.
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D
Seven to nine hours of sleep is the government-mandated minimum for adults.