(Table: Market Shares) Given the Market Shares in the Table

Multiple Choice

(Table: Market Shares) Given the market shares in the table, the four-firm concentration ratio would be
$\begin{array}{|c|c|}\hline \text { Firms } & \text { Market Share } \\\hline \mathrm{A} & 5 \% \\\hline \mathrm{B} & 4 \% \\\hline \mathrm{C} & 10 \% \\\hline \mathrm{D} & 21 \% \\\hline \mathrm{E} & 20 \% \\\hline \mathrm{F} & 7 \% \\\hline \mathrm{G} & 13 \% \\\hline \mathrm{H} & 11 \% \\\hline \mathrm{I} & 6 \% \\\hline \mathrm{J} & 3 \% \\\hline\end{array}$

A) 75.
B) 40.
C) 65.
D) 33.