Answer:
The correct answer is a.
Step-by-step explanation:
Macroeconomics the branch of economics that examines the economy as a whole, such as how rapidly the economy grows, inflation, gross domestic product, unemployment, etcetera. On the other hand, microeconomics is the branch of economics that studies how individuals and enterprises behave in an economy, what guides their decisions, and how the government can influence their behavior. Answers B, C, D all refer to microeconomics, as they're concerned with how individual firms and households behave.