The correct answer is: B. cost
Added value is the difference between the value of a product or service at the end of a production process and the value of the inputs used in that process. It is a measure of the amount of value that a company has added to a product or service.
Option A is incorrect because market value is the price at which a product or service is sold. It is not the same as added value, which is a measure of the amount of value that a company has added to a product or service.
Option C is incorrect because income is the money that a company receives from selling its products or services. It is not the same as added value, which is a measure of the amount of value that a company has added to a product or service.
Option D is incorrect because added value is a measure of the amount of value that a company has added to a product or service. It is not the same as market value, income, or cost.