The North American Fossil Primates Are Not Likely Direct Ancestors

The North American fossil primates are not likely direct ancestors of South American fossil primates known from about 36 mya. What aspects of Eocene and later geography support this idea?

A) North and South America were separated by large,virtually impassable mountains.
B) North America,South America,and Africa were all separated by the sea,but Antarctica could have provided a route from Africa to South America.
C) At the time,North America was connected to Africa,not South America.
D) North America and South America were connected,but the land between them was too dry for primates to live in or migrate across.