Figuer: Main Animal Groups Are Noted at the Right. Names Diverging

Figuer:
Main animal groups are noted at the right. Names diverging at each node are morphological or body form names. Note that the animal traits key to distinguishing the groups and body forms are not shown.

-The proposed common ancestor to all animals,shown at the left of the evolutionary tree,was a

A) plant.
B) protist.
C) bacterium.
D) fungus.
E) None of these answer options is correct. A simplified animal was the proposed common ancestor.