If the correct amount of pollution is being produced now, which of the following is true? The average cost of pollution: a. is exactly equal to the average cost of the pollution reduction. b. can be...

If the correct amount of pollution is being produced now, which of the following is true? The average cost of pollution:

a. is exactly equal to the average cost of the pollution reduction.
b. can be greater than, equal to, or less than the costs of pollution reduction.
c. reduction is greater than the cost of the pollution at all levels of pollution.
d. reduction is less than the cost of the pollution at all levels of pollution.