Which of the following statements is true of costs and pricing​ decisions? A. Companies get profit from selling products only when they are the price makers. B. Companies supply products as long as the price the customer is willing to pay for its products exceeds the price that is charged by the competitor. C. Companies supply products as long as the revenues from selling the additional units exceed the cost of producing them. D. Companies supply products as long as there is a demand for the product in the market regardless of the price at which the products are sold.