The Following Table Shows Four Firms, the Amount Each Pollutes

The following table shows four firms, the amount each pollutes, the marginal cost for each firm to clean up pollution, and the total cost to each firm of eliminating all pollution. $\begin{array}{|c|c|c|c|}\hline \text { Firm } & \begin{array}{c}\text { Total Discharge (in } \\\text { tons) }\end{array} & \begin{array}{c}\text { Marginal Cost of } \\\text { Cleanup } \\\text { (per ton) }\end{array} & \begin{array}{c}\text { Total Cost of } \\\text { Cleanup }\end{array} \\\hline \text { A } & 60 & \$ 5.00 & \$ 300 \\\hline \text { B } & 70 & \$ 8.00 & \$ 560 \\\hline \text { C } & 80 & \$ 7.50 & \$ 600 \\\hline \text { D } & 90 & \$ 4.00 & \$ 360 \\\hline\end{array}$
The total discharge of these four companies is 300 tons. Assume there is no one else who pollutes. If the government establishes a regulation requiring each company to reduce pollution by 50 percent, what will be spent on reducing pollution?

A) $660
B) $910
C) $1,050
D) $1,710