Earthworms are considered friends of the farmers. Select from the following the correct reasons for the same:

(A) Earthworms eat the dead leaves and plants and their droppings fertilize the soil.

(B) Earthworms eat the weeds and save the main crop.

(C) Earthworms soften the soil by digging underneath.

(D) The tunnels made by the earthworms provide easy passage to air and water into the soil.