Answer: B.Marginal cost is the money paid for producing one more unit of a good. Marginal revenue is the money earned from selling one more unit of a good.
Explanation: The money or expenses incurred in the production of a good or service is called cost. Marginal cost simply refers to the cost incurred in producing one more unit of a product or service. Revenue on the other hand refers to the money earned from selling a company's product. Therefore, marginal revenue refers to the amount a producer makes or earns from selling one more unit of a product.
