Which of the following may reduce the MC (marginal cost)of companies emitting SO2pollution?

A)The government eliminated subsidies to companies for reducing pollution.

B)The government is subsidizing scrubbers which are devices that can be used to remove some SO2pollution.

C)Consumers are worried about the pollution and stopped buying the products from companies with high pollution.

D)A study came out suggesting that additional cancers are linked to exposure to SO2pollution.