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. $$\begin{array} { | l | l | } \hline & \text { Market Sh are } \\\hline \text { Firm A } & 45 \% \\\hline \text { Firm B } & 22 \% \\\hline \text { Firm C } & 10 \% \\\hline \text { Firm D } & 8 \% \\\hline \text { Firm E } & 7 \% \\\hline \text { Firm F } & 5 \% \\\hline \text { Firm G } & 2 \% \\\hline \text { Firm H } & 1 \% \\\hline\end{array}$$ TABLE 11- 1
-Refer to Table 11- 1.The four- firm concentration ratio in this industry is %.

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