The correct answer is c) to attempt to make sense of the atrocities he experienced. This is an autobiography, so it is a kind of recollection of his memories and trying to understand all of it. However, he also wanted to tell about his first-hand experience with Holocaust (just like in his novel Night), and to warn the humanity about the consequences of keeping silent and ignoring the evil until it grows so strong that it starts threatening the whole world.
C or D cause it is easy to eliminate A and B
I'd say there are two answers here - she must obey her husband's wishes and follow his advice (he tells her not to teach Douglass how to read) and slavery strips her of her innate beliefs and benevolent nature (she used to be a kind and caring person before she got slaves).
