Why Did the United States Abandon the Gold Standard in the 1930s

Why did the United States abandon the gold standard in the 1930s?

A) The government wanted to rapidly expand the money supply in response to the Great Depression.
B) The government wanted to move away from a floating exchange rate system to a fixed exchange rate system.
C) The Treasury Department in the United States found it was cheaper to print paper money instead of gold coins.
D) New sources of gold were discovered,so the price of gold plummeted,dramatically reducing the value of the dollar.