Parasitic Species Tend to Have Simple Morphologies

Multiple Choice

Parasitic species tend to have simple morphologies. Which of the following statements best explains this observation?

A) Parasites evolved early, and this is why they have simple morphologies.
B) Parasites evolved simple morphologies in order to reproduce successfully in their hosts.
C) Simple morphologies convey some advantages in most parasites.
D) Parasites have simple morphologies to evade detection by their hosts.