Which Statement Is NOT Correct About the Roundworms

Multiple Choice

Which statement is NOT correct about the roundworms?

A) There are three layers of tissues in the body.
B) Roundworms have a tube-within-a-tube body plan.
C) There is an internal body cavity called a pseudocoelom.
D) Roundworms have a smooth,unsegmented outside body wall.
E) Roundworms are essentially no more than parasitic flatworms that have lost their need to be flat.