Table 71 Shows the Quantities of Labor and Capital Required to to Produce

Table 7.1 shows the quantities of labor and capital required to produce various levels of output.
Table 7-1 $$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Amount of } \\\text { Capital }\end{array} & \begin{array} { c } \text { Amount of } \\\text { Labor }\end{array} & \text { Total Product } \\\hline 5 & 1 & 10 \\\hline 5 & 2 & 24 \\\hline 5 & 3 & 42 \\\hline 5 & 4 & 56 \\\hline 5 & 5 & 66 \\\hline 5 & 6 & 74 \\\hline 5 & 7 & 80 \\\hline\end{array}$$
-Refer to Table 7-1.What is the average product of labor when four units of labor are used?

A) 10
B) 14
C) 42
D) 33