When a Firm Produces and Sells a Refrigerator Worth $1,000

When a firm produces and sells a refrigerator worth $1,000, its contribution to the gross domestic product (GDP) on the income side is measured by _____

A) the price paid by the consumer.
B) the cost to the consumer of forgoing another product.
C) the stock of inventories used by the firm to manufacture the refrigerator.
D) the cost to the producer of not producing another product.
E) the sum of the wages, interest, and rent paid by the firm's owners and the profit of the firm.