Explanation:

- Option 1: Capital

- Capital refers to financial assets or the value of financial resources, like cash or buildings.

- It is a stock, not a flow, as it can be measured at a point in time.

- Correct Answer

- Option 2: Income

- Income is the flow of earnings over a period.

- It includes wages, salaries, and other revenue streams.

- Option 3: Investment

- Investment refers to the flow of capital into assets or projects.

- It occurs over time and is considered a flow.

- Option 4: Depreciation

- Depreciation represents the gradual reduction in value of an asset over time.

- It is also viewed as a flow since it happens across periods.