Answer: A a central bank acts to decrease the money supply in an effort to control an economy that is expanding too quickly
Explanation:
Contractionary monetary policy is a form of economic policy used to fight inflation which involves decreasing the money supply in order to increase the cost of borrowing which in turn decreases GDP and dampens inflation.
When the economy is under inflationary pressures, the central bank decreases the money supply by either increase in the discount rate or sale of government bonds or increase in the required reserve ratio or by carrying out all the changes simultaneously.