Consider the Following Production and Cost Schedule for a Firm

Consider the following production and cost schedule for a firm. $$\begin{array}{l}\begin{array} { | l | l | l | l | } \hline \begin{array} { l } \text { Total Number of } \\\text { Units of the } \\\text { Factor }\end{array} & \begin{array} { l } \text { Total Number of } \\\text { Units of Output }\end{array} & \begin{array} { l } \text { Price per Unit } \\\text { of Output }\end{array} & \begin{array} { l } \text { Total Cost } \\\text { of Production }\end{array} \\\hline 2 & 12 & \$ 10 & \$ 50 \\\hline 3 & 20 & \$ 9 & \$ 55 \\\hline 4 & 26 & \$ 8 & \$ 60 \\\hline 5 & 30 & \$ 7 & \$ 65 \\\hline 6 & 32 & \$ 6 & \$ 70 \\\hline 7 & 32 & \$ 5 & \$ 75 \\\hline\end{array}\\\text { TABLE 13- } 3\end{array}$$
-Refer to Table 13- 3. A profit- maximizing firm would never hire more than the unit of this factor of production.

A) 5th
B) 7th
C) 4th
D) 3rd
E) 6th