Mr A borrows money from a bank for a housing mortgage at a fixed interest rate of 7% p.a. After that the general price level falls continuously. In this event, Mr A loses and the bank gains. This is because
A. the value of the mortgaged house has been falling
B. Mr A’s wage income has been falling
C. the bank can sell the house if Mr A fails to repay the loan
D. when the general price level keeps on falling, the purchasing power of a fixed amount of interest will increase.