When someone learns they become aware of what they didn’t know before therefore discovering their ignorance
The answer would be letter D - that Africans can become refined Christians. Wheatley seeks to remind Christians by saying "Remember, Christians..." Wheatley also uses simile to refer the Negros being black like Cain who was marked by God. There's also a metaphor in this excerpt where the angelic train means a heavenly train that brings a person to everlasting bliss.
I think you need to pick a different book....
