Question

While Crane often wrote about the Civil War, Hemingway often wrote about
A.
World War I.
B.
World War II.
C.
the Korean War.
D.
the Vietnam War.

Answer 1

While Crane often wrote about the civil war, Hemingway often wrote about, A. World War l. 

A Farewell to Arms is a novel by Ernest Hemingway set during the Italian campaign of World War l. 

So the answer, which I stated above is, A. World War l.