Assertion (A): Ganga Plain is the most densely populated part of India. Reason (R): Ganga is the most harnessed river of India.

1. (a)Both A and R are true, and R is the correct explanation of A
2. (b)Both A and R are true, but R is not a correct explanation of A
3. (c)A is true, but R is false
4. (d)A is false, but R is true