Table 115 -Refer to Table 11

Table 11.5
$$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Units of } \\\text { Variable } \\\text { Resource }\end{array} & \begin{array} { c } \text { Total } \\\text { Product }\end{array} & \begin{array} { c } \text { Product } \\\text { Price } ( \$ ) \end{array} \\\hline 0 & 0 & 22 \\\hline 1 & 15 & 20 \\\hline 2 & 29 & 18 \\\hline 3 & 42 & 16 \\\hline 4 & 54 & 14 \\\hline 5 & 65 & 12 \\\hline 6 & 75 & 10 \\\hline 7 & 84 & 8 \\\hline 8 & 92 & 6 \\\hline 9 & 99 & 4 \\\hline 10 & 105 & 2 \\\hline\end{array}$$
-Refer to Table 11.5,which shows data for a firm.The first column shows the number of variable resource employed in production,the second column shows the total product of the firm,and the third column shows its product price.If the price paid to a resource is $84,then _____ of the resource are employed.

A) 0 unit
B) 1 unit
C) 2 units
D) 3 units
E) 4 units