Below is Kate's feasible frontier for free time and final grades Final Grade NOT TO SCALE A 90 B 88 70 25 D 14 E 9 13 21 22 Free time per day (hours) Which of the following statements is true? Select one: O a. Kate experiences no trade off when moving from combination F to combination A O b. Kate will be as equally satisfied by combinations A, B, C, D, and E O c. The opportunity cost of an additional hour of free time decreases as Kate moves from combination A down to combination E O d. Combination F is infeasible