Assertion (A): The heart beats faster during exercise.
Reason (R): The body needs more oxygen during exercise.

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• A Both A and R are true, and R is the correct explanation of A.
• B Both A and R are true, but R is not the correct explanation of A.
• C A is true, but R is false.
• D A is false, but R is true.

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Answer: A. Both A and R are true, and R is the correct explanation of A.

Both A and R are true, and R is the correct explanation of A.

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