The United States Aggravated the Worldwide Depression by

The United States aggravated the worldwide depression by

A) denying its former wartime Allies the right to float bonds, or obtain new loans, in the American . securities market after the Allies had defaulted on their debt payments to the U.S.
B) allowing the wartime Allies to default on their debts.
C) enacting unprecedented tariff barriers.
D) creating an imperial tariff union.