Use reasoning to lead to the answer of the following question:
When do platyhelminthes reproductive organs develop?\nOptions:\n- (A) when they become adults\n- (B) It helps them survive\n- (C) produce offspring\n- (D) By wind and rain\n- (E) during the day\n- (F) members of their own species\n- (G) an area swollen with pus\n- (H) Something coming from a gland

(A)
Adult worms go through a major transformation to develop reproductive organs.

Marine flatworms belong to a major group of worms called the Platyhelminthes.

Adult platyhelminthes go through a major transformation to develop reproductive organs.

.

The answer is (A)