Equilibrium exists where the price level is 1.25 and the money supply equals 21 billion. What is a new possible equilibrium when the Federal Reserve buys some government bonds?
A. price level = 1.25, money supply = 21 billion
B. price level = 4, money supply = 21 billion
C. price level = 9, money supply = 25 billion
D. price level = 2, money supply = 25 billion