The Optimal Amount of Pollution Abatement Is Such That

The optimal amount of pollution abatement is such that

A) there is no remaining pollution.
B) governments have successful anti- pollution legislation in effect.
C) the marginal private cost of reducing pollution is just equal to the profit of the polluting firms.
D) the marginal social cost of reducing pollution is just equal to the marginal social benefits from doing so.
E) none of the above; there is no optimal amount of pollution abatement .