What Was an Element of U

What was an element of U.S. economic diplomacy in the 1920s?

A) reducing the tariff to allow other nations to sell their goods in the U.S.
B) reducing German reparation payments to the victorious Allies in return for helping stabilize the German economy
C) canceling World War I debts owed by European nations to the U.S. in order to make it feasible to reduce German reparations
D) promoting arms sales abroad to bankrupt rival powers