Total Revenue =

Price is the amount of money that a customer pays for a product or service. It is determined by a number of factors, including the cost of production, the demand for the product or service, and the competition.

Quantity is the number of units of a product or service that are sold. It is determined by a number of factors, including the price of the product or service, the marketing efforts of the company, and the preferences of consumers.

Income is the total amount of money that a person or company receives during a period of time. It is calculated by adding up all of the sources of income, such as wages, salaries, interest, and dividends.

Therefore, the correct answer is A. Price × Quantity.