The Table Below Shows the Marginal Benefit and Marginal Cost

The table below shows the marginal benefit and marginal cost of pollution abatement for an economy.
TABLE 17-1
-Refer to Table 17-1.Suppose a public authority has the mandate to maximize social welfare by choosing the appropriate amount of pollution abatement.The total net benefit from the optimal amount of pollution abatement is

A) $0.
B) $120.
C) $155.
D) $275.
E) $330.