Suppose a Farm That Is Polluting an Underground Water Supply

Suppose a farm that is polluting an underground water supply faces the following marginal costs for abating units of pollution: 1st unit abated,MC = $250 2nd unit abated,MC = $400 3rd unit abated,MC = $650 4th unit abated,MC = $950
The marginal benefit to society from this farm abating units of pollution are as follows: 1st unit abated,MB = $1000
2nd unit abated,MB = $800 3rd unit abated,MB = $650 4th unit abated,MB = $300
What is the total net benefit to society if this farm engages in the socially optimal amount of pollution abatement?

A) $1150
B) $0
C) $2250
D) $650
E) $1300