Answer:
The correct answer is option A.
Step-by-step explanation:
Macroeconomics can be defined as the branch of economics which studies the economy as a whole. It is directly in contrast to microeconomics which studies individual economic agents such as cost conditions of a single firm, or supply from a single market or a demand curve of a consumer.
Unlike microeconomics, the study of macroeconomics involves variables such as inflation, unemployment, economic growth, business cycles, etc. It is concerned with large scale economic factors.