Variable Cost Is The

Variable cost is the:

A) total expense incurred by a firm in producing and marketing a product or service.
B) sum of the expenses of the firm that are stable and do not change with the quantity of the product that is produced and sold.
C) money or other considerations (including other goods and services) exchanged for the ownership or use of a good or service.
D) sum of the expenses of the firm that vary directly with the quantity of the product that is produced and sol