Question

Which question would be the best topic for a five-page research paper?

A. Where did the pony express operate?
B. When did the U.S. Postal Service begin?
C. What effects had the postal service had on the history of the United States.
D. How did the postal service help develop U.S. roads and railroads?

Answer 1

C, the rest can be answered with short answers, while this one can be stretched out onto the 5 pages. 

Answer 2

I think option c because there is more information you can gather on it!