Assertion (A): Black soils are suitable for cotton cultivation.
Reason (R): They are rich in humus.

Select the correct answer from the codes given below:

A) Both (A) and (R) are true, and (R), but (R) is the correct explanation of (A).

B) Both (A) and (R) are true, and (R), but but (R) is not the correct explanation of (A).

C) (A) is true, but (R) is false.

D) (A) is false, but (R) is true.

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 2013 (GS Paper I)