Answer:
D) that Africans can become refined Christians
Step-by-step explanation:
This excerpt shows that anyone can become a refined Christian, including the Africans, who according to the text, are black like Cain.
In the past, many believed that the sign in Cain was a dark skin - that God changed the color of Cain's skin to black in order to identify him. Since Cain also received a curse, the belief that the mark was black skin led many to believe that dark-skinned people were cursed. And because of this "curse" is that the excerpt speaker says that even blacks (the cursed ones) can become refined Christians