Paper Pushers Inc The VMP of the Sixth Worker Is ________ Than the Apart

Paper Pushers Inc. hires workers in a competitive labor market. Apart from labor, the company has no other variable inputs. The company's hourly output varies with the number of workers hired, as shown in the table.  
$$\begin{array} { | c | c | } \hline \text { Warkers } & \text { Puges/huur } \\\hline 0 & 0 \\\hline 1 & 40 \\\hline 2 & 75 \\\hline 3 & 105 \\\hline 4 & 125 \\\hline 5 & 140 \\\hline 6 & 150 \\\hline 7 & 155 \\\hline\end{array}$$  
The VMP of the sixth worker is ________ than the VMP of the fourth worker because ________.

A) less; the firm experiences economies of scale
B) more; of the law of increasing returns
C) less; of the law of diminishing returns
D) more; workers can specialize and exploit their comparative advantage