17. Which of the following government actions may be taken under the Clean Air Act?

A) A factory may be required to limit its emissions of substances that contribute to smog.

B) A power plant may be required to limit its emissions of sulfur oxides to a certain number of pounds per Btu of energy produced.

C) Bakeries in certain areas may be required to further control its emissions from baking.

D) A and B.

E) All of the above