I would say C. It seems like he is saying that the two have different strategies.
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.
Many things, the Quarterly act, Proclamation of 1763, Stamp act, Townsend act, etc AKA this was known as "TAXATION WITHOUT REPRESENTATION".