After World War I, the United States Returned to a State

After World War I, the United States returned to a state of "normalcy" in foreign policy, which meant

A) a continued commitment to international peacekeeping.
B) reassuring the public that the United States would act in the role of world policeman.
C) a sharp increase in military spending in order to honor commitments made to the allied powers.
D) a reduction in military forces and defense spending and a return to isolationism.
E) the annexation of additional territory in the Western Hemisphere.