Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** During vigorous exercise, hemoglobin releases oxygen more readily to the skeletal muscles. **Reason (R):** Increased metabolic activity in muscles produces more carbon dioxide and lactic acid, lowering the local pH and decreasing hemoglobin's affinity for oxygen. Select the correct answer using the code given below:

Options:

• 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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