Which one of the following is considered to be a "stock" rather than a "flow" variable?

Question

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A stock variable represents a quantity at a specific point in time, while a flow variable represents a quantity over a duration of time. Money is a stock variable as it represents the amount of currency held at a specific point in time. Income, wages, and profits are all flow variables as they represent the amount earned over a period of time.

Which One of the Following Is Considered to Be a "Stock