I'll give you a question, please answer with step-by-step reasoning process.
Phylum platyhelminthes are mostly what?\nOptions:\n- (A) animals\n- (B) engorged\n- (C) fungi\n- (D) infected\n- (E) parasitic\n- (F) insects\n- (G) huge\n- (H) free living

(E)
Flatworms belong to the phylum Platyhelminthes.

Most of the flatworms are parasitic, although the Turbellaria are free-living in fresh water.

Phylum Platyhelminthes are mostly parasitic.

.

So, the final answer is (E)