Explain Each optionAnd why a wrong

15. Which statement is true? a. Marginal cost eventually increases in the short run as a competitive firm needs to start paying more for each variable input used. b. Marginal cost eventually increases in the short run for a competitive firm because of diminishing marginal product c. Diminishing marginal product in the short run can occur in a firm that also has economies of scale. d. Both b and c are true. e. Both a and c are true