Given below are two statements, one is labelled as Assertion (A) and other as Reason (R): Assertion (A): Teesta River was earlier a tributary of Ganga now it is a tributary of Brahmaputra. Reason (R): River capturing is a major feature of Himalyan Rivers. Select the correct answer using the codes given below. Codes:

• (a)Both (A) and (R) are true and (R) is 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