Please help me solve this

John borrowed $3,000 from his bank for one year at 9%. If the rate of inflation turned out to be 6%, what can you say about the bank's purchasing power from this operation, when the loan is paid back? O A. The bank's real purchasing power increased by 15.54%. O B. The bank's real purchasing power decreased by 2.75%. O C. The bank's real purchasing power increased by 3.00%. O D. The bank's real purchasing power increased by 2.83%