Given below are two statements, one labeled as Assertion (A) and the other as Reason (R). **Assertion (A):** Bimbisara's matrimonial alliances were not merely social unions but strategic diplomatic maneuvers. **Reason (R):** These alliances secured the frontiers of Magadha, neutralized potential rivals, and paved the way for eastward expansion. In the context of the above statements, which of the following is correct?

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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