When the central bank acts in a way that causes the money supply to increase while aggregate demand remains unchanged, it is

a) following an expansionary monetary policy.
b) following a contractionary monetary policy.
c) following a tight monetary policy

A) following an expansionary monetary policy.

Explanation:

Central Bank through the Federal Reserve can influence money supply in the economy. If it causes the money supply to increase while keeping the aggregate demand constant, it is following an expansionary monetary policy. This can occur in various ways like through decreasing interest rates, buying bonds in the open market operations; known as quantitative easing, or by lowering the reserve requirement ratio for banks and other financial institutions.

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