The figure given below shows equilibrium in a money market.Which of the following will be observed if the money supply curve shifts from S to S' while the rate of interest remains at "r"?
A) There will be an excess demand for money.
B) There will be an excess supply of money.
C) The Fed will buy U.S.Treasury securities.
D) The quantity of money demanded will fall.
E) The quantity of money supplied will fall.