Assertion (A): Sustainable agriculture is environment-friendly.
Reason (R): It prevents the use of chemical fertilizers to protect soil.
(A) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(B) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(C) (A) is correct but (R) is not correct.
(D) (A) is not correct but (R) is correct.