How Did Europeans Initially Justify the Enslavement of Africans

How did Europeans initially justify the enslavement of Africans?

A) Europeans, who were culturally and racially superior, offered guidance to the inferior Africans.
B) Africans were an alien group unlike any other and were out of necessity placed into bondage.
C) Africans were a people biologically distinct from the Europeans, and Africans' physical characteristics produced less intelligent, more primitive people.
D) Enslavement benefited Africans by bringing Christianity to them.