The marginal cost of production shows the change in a firm's total cost from producing one more unit of a good or service. What is the shape of the marginal cost curve? Graphically, the marginal cost curve is OA. shaped like a hill, initially rising when the marginal product of labor is falling and then eventually falling when the marginal product of labor is rising. OB. a U shape, initially falling when the marginal product of labor is rising and then eventually rising when the marginal product of labor is falling OC. a U shape, initially falling due to diminishing returns and then eventually rising due to division of labor. OD. a U shape, initially falling when the marginal product of labor is below marginal cost and then eventually rising when the marginal product of labor is above marginal cost. E. shaped like a hill, rising when the average cost of production is rising and then eventually falling when the average cost of production is falling