Explanation:

- Macroeconomics:

- Correct Answer

- It's the study of economy-wide phenomena, including aggregates like GDP, unemployment rates, and national income.

- Microeconomics:

- Focuses on individual units, such as consumers and businesses, and their decision-making processes.

- Price Theory:

- It's concerned with the determination of prices for goods and services through supply and demand.

- Factor Price Determination:

- Deals with how the prices of factors of production like labor, land, and capital are determined.