Use the Following to Answer Questions: Table: Pollution Abatement -(Table: Pollution Abatement) Refer to the Table

Use the following to answer questions: Table: Pollution Abatement $$\begin{array} { c c c } \hline \text { Firm } & \begin{array} { l } \text { Pollution Level } \\\text { (tons of } \mathrm { SO } _ { 2 } \text { ) }\end{array} & \begin{array} { l } \text { Cost of Removing One } \\\text { Ton of Pollution }\end{array} \\\hline \mathrm { A } & 30 & \$ 100 \\\mathrm {~B} & 30 & \$ 500 \\\hline\end{array}$$
-(Table: Pollution Abatement) Refer to the table. If the government wants to reduce 4 tons of pollution, what is the total cost of doing so if firms trade pollution allowances?

A) $400
B) $2,000
C) $1,200
D) $2,400