Answer the following question, with explanation first.
What produces both eggs and sperm?\nOptions:\n- (A) Plant reproduction\n- (B) sub-units of species\n- (C) gastropod shells\n- (D) an individual mature sponge\n- (E) Microscopic organisms\n- (F) members of their own species\n- (G) peachleaf willow\n- (H) seed dispersal

(D)
Adult sponges produce eggs and sperm.

An adult is mature, fully developed.

Mature sponges produce eggs and sperm.

.

The answer is (D)