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.
Answer:
Allied with green?
Metaphors- The snow is a white blanket.
He is a shining star.
Her long hair was a flowing golden river.
Explanation:
B, A, C, A (this last one I am not positive about)