Answer:
C. The Federal Reserve will need to have official reserves of euros to purchase dollars in the foreign exchange market.
Step-by-step explanation:
Federal Reserve required to have a euros reserves as it can applied it also at the case when the exchange rate is move upward or downward
For the other things, the fed could restrict the supply with respect to the dollar in the foreign exchange market in order to get it stable that opposed with euro
Therefore the option c is correct