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 :
Codes :

1. A.Both (A) and (R) are true and (R) is the correct explanation of (A)
2. B.Both (A) and (R) are true, but (R) is not the correct explanation of (A)
3. C.(A) is true, but (R) is false.
4. D.(A) is false, but (R) is true.