JEE Main 2021 Chemistry question

Assertion (A) : Heavy water is used for the study of reaction mechanism. Reason (R) : The rate of reaction for the cleavage of O-H bond is slower than that of O-D bond. Choose the most appropriate answer from the options given below.

• (A)Both (A) and (R) are true but (R) is not the true explanation of (A).
• (B)Both (A) and (R) are true and (R) is the true explanation of (A).
• (C)(A) is false but (R) is true.Correct
• (D)(A) is true but (R) is false.