Answer:C.The Federal Reserve could sell goverments bonds.
D. The federal reserves could buy US dollars in the foreign exchange market and sell other currency it holds.
Step-by-step explanation:
The supply factor in a foreign exchange market determined to a large extent the value of a currency.
The higher the supply of foreign currency the lower the value and vice versa.
To boost the value of dollar efforts should be towards reducing the volume of dollars in circulation and this could be achieved by selling goverments bonds and buying dollars in the foreign exchange market and selling other currency it holds.
Buying goverments bonds or selling dollars will increase the volume of dollars in circulation and invariably reduce the value.