The main theme of “the wanderer” involves the
a. value of friendship.
c. importance of traditions.
b. need for safety.
d. pain of homelessness.

The correct answer is D) pain of homelessness. Because the Wanderer is all by himself - he has nowhere to go, everybody he knows is dead, and he is alone in the world. He want to find a home, somewhere to belong to, but he cannot, so he longs for a home and feels the pain of homelessness. 

The answer is "he was bad enough in all conscience, but the devil himself could not temp him to turn slave-trader. satirical is a synonym for sarcastic. so when the author says that tom walker could not be tempted by the devil he does not literally mean "the devil" but he means that he is too morally upright to become a slave-trader.