Option B is the correct answer. The Federal Reserve will have to set up the Reverse Repo facility in which these nonbank lenders can lend to the Fed and earn an interest rate.
In order to make sure that the federal funds rate does not fall below the floor which has been set by the interest rate on excess reserves, the Federal Reserve needs to set up the Reverse Repo facility which will let the nonbank lenders that can lend to the Fed and earn an interest rate that is close to the interest rate the Fed pays on excess reserves.
Hence, the correct answer is Option B.
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