Which statement is TRUE?

Group of answer choices

a.If the EPA cares about the sum of consumer and producer surplus, they should ignore the impact of pollution reduction on the profitability of firms.

b. To maximize social surplus, the burden of reducing pollution should be allowed to vary by industry.

c. Mandating that every firm emit no more than X amount of pollutants is the most efficient method of reducing pollution.

d. A system of tradable allowances increases pollution because firms can pay for the right to pollute.