The correct answer is C.
After the sucess of keynesian economics and generalized usage of fiscal policy to boost aggregate demand and to generate economic growth, monetarists promoted the usage of monetary policy mechanisms instead. They defended that it was not the Great Depression era anymore, and hence the liquidity trap was not operating and the arguments given by Keynes to defend fiscal policies over monetary policies were not valid anymore.
Monetarists believed that controlling the money supply was the most powerful tool that goverments had to control economic cycles and that every economic authority should implement an automatic monetary program.