Which of the Following Lies Primarily Within the Realm of Microeconomics

Multiple Choice

Which of the following lies primarily within the realm of microeconomics?

A) an economic model forecasting the impact of a tax increase on consumer spending and national output
B) a model forecasting the impact of a change in interest rates on the level of investment in the economy
C) an empirical analysis of the relationship between the growth of the money supply and the rate of inflation
D) a study of supply and demand conditions in the market for orange juice