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.
-Prior to the divergence of animals,an ancestor is proposed to have developed the key shared trait of all animals,the

A) presence of a mouth by which to consume nutrition materials.
B) body form of having true tissues.
C) body form of multicellularity.
D) embryonic development of the mouth first, from embryonic cells.
E) ganglia or brain cells to control all motion.