A Student Observes a Worm-Like Organism Crawling About on Dead

Multiple Choice

A student observes a worm-like organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot) . On the other hand, it might be a member of which phylum, and one way to distinguish between the two possibilities is by looking for the presence of

A) Platyhelminthes; a cuticle of chitin.
B) Nematoda; an alimentary canal.
C) Annelida; a body cavity.
D) Nematoda; a circulatory system.
E) Annelida; muscle in the body wall.