What are basal anthropoids?
a. eocene primates that are the earliest anthropoids
b. paleocene primates that may have been the first anthropoids
c. eocene organisms that may have been the first primates
d. paleocene organisms that may have been the first primates

a. Eocene primates that are the earliest anthropoids    

Explanation:

The answer is

a. Eocene primates that are the earliest anthropoids.

Basal anthropoids are the Eocene primates that are the most primitive anthropoids existed.

Primates are referred as an order of animals or mammals that are characterized by their large brains and their complex behavior. This includes apes and primitive humans.

Thus the answer is --

a. Eocene primates that are the earliest anthropoids

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