Assertion (A): We get large watershed areas in hilly areas. Reason (R): The topography of a hilly region is undulating.

Question: Assertion (A): We get large watershed areas in hilly areas. Reason (R): The topography of a hilly region is undulating.

Options:

Both are correct, A is the correct explanation of B.
Both are correct, A is not the correct explanation of B.
Only A true.
Only B true.