Frank Owns an Apple Farm and Plans to Spend 4

Multiple Choice

Frank owns an apple farm and plans to spend 4 hours today picking apples. The number of apples he can pick per hour depends on the total number of hours he spends working in either the east orchard or the west orchard in the manner shown in the accompanying table below. $$\begin{array} { | c | c | c | c | } \hline \begin{array} { c } \text { Muurs in East } \\\text { Orchard }\end{array} & \begin{array} { c } \text { Number af Apples } \\\text { Per Hour }\end{array} & \begin{array} { c } \text { Hours in West } \\\text { Orchard }\end{array} & \begin{array} { c } \text { Number d Apples } \\\text { Per Hour }\end{array} \\\hline 1 & 40 & 1 & 10 \\\hline 2 & 32 & 2 & 10 \\\hline 3 & 25 & 3 & 10 \\\hline 4 & 20 & 4 & 10 \\\hline\end{array}$$  
What is the opportunity cost to Frank of spending an additional hour picking apples in the East orchard?

A) 10 apples
B) 20 apples
C) 30 apples
D) 40 apples