"Many students believe that studying late at night helps them concentrate better. However, research suggests that getting enough sleep is more beneficial for memory retention and problem-solving skills."
Question:
What is the main idea of the passage?
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A
Students study better late at night.
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B
Sleep improves memory and problem-solving skills.
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C
C. Concentrating late at night is a proven method for studying.
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D
Research discourages studying at night.