Plantation Owners in America Often Argued That the Africans They

Plantation owners in America often argued that the Africans they imported were better off as slaves because they did not have the mental capacity to run their own lives.Today,this seems both racist and crazy.How could such racist beliefs flourish?

A) People are, by nature, hostile and look to blame their problems on others.
B) Such beliefs justify social arrangements between dominant and minority groups that benefit those who accept them.
C) People knew much less about world history then, so it seemed more plausible.
D) Nineteenth-century science was not very well developed, so no authority figures could debunk racist beliefs.