Given below are two statements, one is labeled as Assertion (A) and other as Reason (R). Assertion (A): The Stone Age people of the Vindhyas migrated to the Ganga Valley in terminal Pleistocene period. Reason (R): Due to climatic change, it was dry phase in this period. Choose the correct answer from the code given below.

• (a)Both (A) and (R) are true and (R) is the correct explanation of (A)
• (b)Both (A) and (R) are true and (R) is not the correct explanation of (A)
• (c)(A) is true but (R) is false
• (d)(A) is false but (R) is true