Refer to the Accompanying Table A)60 Cakes

Multiple Choice

Refer to the accompanying table. Julia's opportunity cost of making a pie is: $$\begin{array} { | l | c | c | } \hline & \text { Time ta Make a Pie } & \text { Tirne to Muke a Cake } \\\hline \text { Martha } & 60 \text {minutes } & 80 \text { minutes } \\\hline \text { Julia } & 50 \text { minutes } & 60 \text { minutes } \\\hline\end{array}$$  

A) 60 cakes.
B) 6 cakes.
C) 6/5 of a cake.
D) 5/6 of a cake.