[MUST SHOW WORK] In a day, Frida can bake 15 pies or 10 cakes; Robi can bake 6 pies or 3 cakes. Then Question 16Select one: A. Frida's opportunity cost of a cake is 2/3 pies. B. Frida's opportunity cost of a cake is 3/2 pies. C. we cannot determine the opportunity cost without additional information. D. Robi's opportunity cost of a cake is 3 pies. E. Robi's opportunity cost of a pie is 2 cakes