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

(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 a correct explanation of A

(c)

A is true, but R is false

(d)

A is false, but R is true