Assertion (A): Earthworms are called "Friends of Farmers"

Reason (R): Earthworms not only act as nature's plough but also enriches the fertility of the soil by depositing "worm castings" in the soil

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

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

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

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