Refer to the Table

Multiple Choice

$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Hourly Wage } \\\text { Rate }\end{array} & \begin{array} { c } \text { Output per Hour of } \\\text { Work }\end{array} \\\hline \$ 10 & 6 \\\hline 9 & 6 \\\hline 8 & 4 \\\hline 7 & 2 \\\hline 6 & 1 \\\hline\end{array}$$ Refer to the table. The e?ciency wage is

A) $10.
B) $9.
C) $8
D) $6.