which of the following statements is true? i. sunk costs are never relevant in decision making. ii. sunk costs and future costs that do not differ between the alternatives may or may not be relevant in a decision. iii. fixed costs are sunk costs. which of the following statements is true? i. sunk costs are never relevant in decision making. ii. sunk costs and future costs that do not differ between the alternatives may or may not be relevant in a decision. iii. fixed costs are sunk costs. only statement iii is true. all statements are true. none of the statements are true. only statement i is true.