Table 10-5 The following table shows the marginal costs for each of four firms (A, B, C, and D) to eliminate units of pollution from their production processes. For example, for Firm A to eliminate one unit of pollution, it would cost $54, and for Firm A to eliminate a second unit of pollution it would cost an additional $67. Firm Unit to be eliminated A B C D First unit 54 57 54 62 Second unit 67 68 66 73 Third unit 82 86 82 91 Fourth unit 107 108 107 111 43. Refer to Table 10-5. If the government charged a fee of $84 per unit of pollution, how many units of pollution would the firms eliminate altogether? a. D. 8 C. 9 d. 10