Table 10-1 Quantity (Units) Private Value (Dollars) Private Cost (Dollars) External Cost (Dollars) 1 14 10 2 2 13 11 2 3 12 12 2 4 11 13 2 5 10 14 2 6 9 15 2 7 8 16 2 Refer to Table 10-1. How large would a corrective tax need to be to move this market from the equilibrium outcome to the socially optimal outcome? a. $3 b. $10 c. $2 d. $9