All of the Following Are Problems That Remain to Be

Multiple Choice

All of the following are problems that remain to be solved in the United States with respect to air pollution except

A) Dramatically reducing emissions from older power and industrial plants
B) The current laws do not deal seriously with indoor air pollution.
C) Enforcement of the Clean Air Act is too stringent.
D) Airports are exempt from many air pollution regulations.
E) Two-cycle engines need to be regulated more effectively.