An Upward- Sloping Marginal Cost Curve for Pollution Abatement Means

An upward- sloping marginal cost curve for pollution abatement means that

A) additional increments of pollution abatement will yield decreasing benefits.
B) it is impossible to know the benefits from additional increments of pollution reduction.
C) the marginal benefit of pollution reduction will increase with additional increments of pollution reduction.
D) the cost of an extra unit of pollution abatement will increase as the total amount of abatement rises.
E) society views additional increments of pollution reduction as absolutely necessary.