Which of the following is a macroeconomic question?
a) How much would the unemployment rate fall if the economy grows by 4% this year?
b) What is the effect of unemployment on a worker's lifetime earnings?
c) Should the Federal government increase the level of regulation of the airline industry?
d) What effect does a rise in the stock market have on the age at which one retires?

Might have to go with c

The federal reserve took an expansionary approach during the crisis. this was done by expanding the money supply and boosting liquidity. this can be seen in the fed's actions of lending to banks, purchasing securities, and lowering the federal funds rate in order to lower overall interest rates. the fed's goal was to increase consumer spending and overall liquidity within the system, and they pursued this by expanding the supply of liquid money.