Macroeconomics is
a. the study of the economy as a whole, including topics such as inflation, unemployment, and economic growth.
b. the study of how households and firms make choices, how they interact in markets, and how the government attempts to influence their choices.
c. the study of "large" (greater than $100,000) economic transactions in the economy.
d. the study of firms as a group with special emphasis on how these firms interact with one another.

The correct answer is option A.

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.  

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