The answer is A, cause/effect. Marcia is focusing on how the war started, what ended it, and how it affected America. Cause/effect covers all these things, while the other answers either skip over these things completely or concentrate on only a few.
Must put the story in there.
Maybe it’s his taxes to pay for the house and for the benefits of his family or maybe an argument with his partner or one of his family members.
I think it is present perfect.
