For Whom the Bell Tolls clearly represents a new beginning in Ernest Hemingway’ s career as a writer, which concerns a volunteer American guerrilla Robert Jordan fighting in（）.

For Whom the Bell Tolls clearly represents a new beginning in Ernest Hemingway’ s career as a writer, which concerns a volunteer American guerrilla Robert Jordan fighting in（）.

A.the Spanish Civil War

B.the American Civil War

C.World War I

D.World War II

正确答案是A