Assertion(A):- Northern Plains is a densely populated physiographic division of India.

Reason:- With a rich soil cover combined with adequate water supply and favourable climate it is agriculturally productive part of India.

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.​