Question 43 1 pts 43. As output increases A average fixed cost falls B average fixed cost is unchanged C average fixed cost rises O B OC Question 44 1 pts 44. A sunk cost is a cost that once incurred can A never be recovered only be recovered in the long run O E Question 45 1 pts 45. Here are four statements about revenue, costs, and profit. If a firm earns revenue greater than explicit cost, it earns an accounting profit. If a firm earns revenue greater than implicit cost, it earns an economic profit. Accounting profit can never exceed economic profit. Economic profit can never exceed accounting profit. Choose the correct option from the list below. A Only I and IV are true. B Only II and III are true. C All four are true