6. If the bank reserve ratio is 20% and banks do not hold excess reserves, when the Fed sells $30 million of T-bills, bank reserves a. decrease by $30 million and the money supply eventually decreases by $120 million b. increase by $30 million and the money supply eventually increases by $150 million c. decrease by $30 million and the money supply eventually decreases by $150 million d. increase by $30 million and the money supply eventually increases by $120 million