Using the Equation of Exchange,the Existence of a Natural Rate

Multiple Choice

Using the equation of exchange,the existence of a natural rate of unemployment implies that in the long run:

A) Velocity in the equation of exchange is actually very unstable.
B) Monetary policy affects only the rate of inflation.
C) Quantity of real output in the equation of exchange varies in proportion to money supply.
D) The rate of unemployment can be permanently reduced by more expansionary monetary and fiscal policies.