Which aspect of Africa’s physical geography had the greatest influence on European colonization of Africa?

A.
Africa was rich in natural resources that Europeans needed.

B.
Africa's river systems made it easy for Europeans to reach the African interior.

C.
Africa's size gave European nations a place to house their growing populations.

D.
Africa's climate attracted farmers and other European settlers.

B. Africa's river systems made it easy for Europeans to reach the African interior.