Microbial Eukaryotes Are Ecologically and Evolutionarily Important for Many Reasons

Microbial eukaryotes are ecologically and evolutionarily important for many reasons.Which statement about this group is false?

A) Multicellular groups evolved from microbial eukaryotes.
B) Photosynthetic microbial eukaryotes play a major role in the energy balance of the living world.
C) There are no parasitic forms of microbial eukaryotes.
D) Saprobic microbial eukaryotes are among the important decomposers and thus play a major role in the nutrient cycles of the living world.
E) Many microbial eukaryotes have highly differentiated bodies,even though they consist of only one cell.