An Assertion (A) and a Reason (R) are given below.

Assertion (A): Most ancient civilizations developed near rivers.

Reason (R): Man's main occupation was agriculture.

choose the right option.

A. A is correct but R is false.

B. A is false but R is correct.

C. Both A and R are correct and R is the appropriate explanation of A.

D. Both A and R are correct but R is not an appropriate explanation of A.