Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** Gypsum is added in small quantities (2-3%) during the final grinding of Portland cement clinker. **Reason (R):** Gypsum accelerates the hydration of tricalcium aluminate, leading to rapid hardening of the concrete mix. 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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