Given the Total Product Schedule Below, at What Level of Labor

Multiple Choice

Given the total product schedule below, at what level of labor is the average product the highest?
$$\begin{array} { | l | l | l | l | l | l | l | l | } \hline \text { Units of Labor } & 0 & 1 & 2 & 3 & 4 & 5 & 6 \\\hline \text { Total Product } & 0 & 2 & 5 & 9 & 11 & 13 & 14 \\\hline\end{array}$$

A) 2
B) 3
C) 4
D) 5