Refer to the Table Below A)3/4 of a Pie

Multiple Choice

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

A) 3/4 of a pie.
B) 4/3 of a pie.
C) 6 pies.
D) 60 pies.