Consider the market diagram with quantity of money on the x axis, interest rates on the y axis, and a two lines representing money supply and money demand. Assuming the central bank targets money supply, describe this diagram.

A. The money supply curve slopes downward and the money demand curve slopes upward

B. The money supply curve is vertical and the money demand curve slopes upward

C. The money supply curve is vertical and the money demand curve slopes downward

D. The money supply curve slopes upward and the money demand curve slopes downward