In a day, Frida can bake 15 pies or 5 cakes; Robi can bake 6 pies or 3 cakes. Then Question 32Select one: A. we cannot determine the opportunity cost without additional information. B. Robi's opportunity cost of a pie is 1/2 cake. C. Frida's opportunity cost of a pie is 5 cakes. D. Frida's opportunity cost of a pie is 3 cakes. E. Robi's opportunity cost of a cake is 1/2 pie