Answer:
A. A central bank acts to increase the money supply.
Step-by-step explanation:
The main objective of the expansionary policy is to improve the aggregate demand to make up for the shortfalls in the private demand. The Expansionary monetary policy is when the central bank uses some of its tools to increase the money supply to stimulate or boost the economy. It works by expanding of the money supply at a faster rate than the usual. It increases the demands, lowers the rate of interest and increases the money supply.