The Chart Below Describes the Short Run Productivity of Workers

The chart below describes the short run productivity of workers at Paper Pushers Inc. ,an office support firm that has no variable costs other than labor. $$\begin{array} { | l | l | } \hline \text { Workers } & \text { Pages per Hour } \\\hline 1 & 40 \\\hline 2 & 75 \\\hline 3 & 105 \\\hline 4 & 125 \\\hline 5 & 140 \\\hline 6 & 150 \\\hline 7 & 155 \\\hline\end{array}$$
If the workers are producing a product that sells for $2.00 per page this firm will

A) hire all seven workers if wages are $20.
B) hire all seven workers if wages are $10.
C) hire all seven workers only if wages are $5 or less.
D) always hire the seventh worker.