Marginal cost refers to the amount of money it cost a company to produce one more of a particular product while the marginal benefit refers to the benefit that is obtained as a result of producing that one extra product. Profit is maximized when the marginal cost equals the marginal benefits.
The right answer for the question that is being asked and shown above is that: "D. Not Affected By." People keep spending additional units of a particular resource on a want until their marginal benefit is Not Affected By their marginal cost.
