If at the End of the Business Day a Bank

If at the end of the business day a bank has $50,000 in excess reserves,and the required reserve ratio is 20 percent,the bank can maximize its profits if it

A) keeps the excess reserves
B) loans out $40,000
C) loans $50,000 to another bank
D) borrows $50,000 to remove the excess reserves
E) keeps $10,000 and deposits $40,000 with the Fed