The most primitive primates are considered to be the

A) prosimians.
B) apes.
C) New World monkeys.
D) Old World monkeys.
E) humans.

Prosimians are considered the most primitive primates because they are the most ancient group of living primates, with traits that resemble the earliest known primates from the Eocene epoch. They have characteristics such as a smaller brain relative to their body size, a reliance on olfactory senses, and claws instead of nails. This is in contrast to other primate groups, such as apes and Old World monkeys, that have more evolved characteristics such as larger brains, enhanced visual acuity, and opposable thumbs.