Which statement explains why the Neutrality Acts changed between 1935 and 1939?
A. Between 1935 and 1939, the U.S. sales of war materials decreased.
B. Between 1935 and 1939, war broke out in Europe and Asia.
C. Between 1935 and 1939, U.S. foreign policy became more isolationist.
D. Between 1935 and 1939, the United States joined the Allied powers.