Given below are two statements, one labelled as Assertion (A) and the other as Reason (R). **Assertion (A):** Mature mammalian erythrocytes (RBCs) lack a nucleus, mitochondria, and endoplasmic reticulum. **Reason (R):** The absence of these organelles provides more internal space for hemoglobin and prevents the RBCs from consuming the oxygen they transport via aerobic respiration. Select the correct answer using the codes 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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