What Has Been the Result of Regulatory Policies Designed to Curb

Multiple Choice

What has been the result of regulatory policies designed to curb air pollution,such as the Clean Air Act?

A) Levels of air pollution have fallen only slightly,much to the disappointment of the Environmental Protection Agency.
B) Levels of air pollution have continued to increase,despite the regulations.
C) Levels of air pollution have fallen dramatically,though pollution has not been completely eliminated.
D) Levels of air pollution have remained the same,though they probably would be higher without the government policies.