Read the passage: 'The study found that participants who slept fewer than six hours per night made significantly more errors on cognitive tests than those who slept seven or more hours.' What did the study conclude about sleep and cognitive performance?
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A
Eight hours of sleep is the minimum required
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B
Cognitive performance is unrelated to sleep duration
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C
Sleeping fewer than six hours led to more cognitive errors
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D
Participants who slept more were naturally smarter