Answer:
The correct answer is letter "C": if depository institutions are short of reserves, they can borrow from the Fed.
Explanation:
The Federal Reserve (Fed) is the central bank of the United States and is in charge of reviewing and passing monetary policies, regulations on banks and supervising their activities. The Fed serves as a lender of last resort in cases when banks cannot meet their minimum financial obligations and there is risk the collapse of those financial institutions will affect the overall economy.
Therefore, if a depository entity is short of reserves, other banks must be the first resource of aid but if the institution cannot get the funds from other banks, the Fed acts as the last resource the depository entity could rely on.