The Table Below Shows the Market Shares for the Only

The table below shows the market shares for the only firms in a domestic cement market. $$\begin{array}{l}\begin{array} { | c | c | } \hline & \text { Market Share } \\\hline \text { Firm A } & 45 \% \\\hline \text { Firm B } & 22 \% \\\hline \text { Firm C } & 10 \% \\\hline \text { Firm D } & 8 \% \\\hline \text { Firm E } & 7 \% \\\hline \text { Firm F } & 5 \% \\\hline \text { Firm G } & 2 \% \\\hline \text { Firm H } & 1 \% \\\hline\end{array}\\\text { TABLE 11- } 1\end{array}$$
-Refer to Table 11- 1. The four- firm concentration ratio in this industry is percent.

A) 67
B) 45
C) 85
D) 92
E) 100