In congress dramatically revised and expanded the clean air act, providing epa even broader authority to implement and enforce regulations reducing air pollution emissions. these amendments also placed an increased emphasis on more cost-effective approaches to reduce air pollution.

The correct answer is: In 1990, Congress dramatically revised and expanded the Clean Air Act, providing EPA even broader authority to implement and enforce regulations reducing air pollution emissions. (...)

Explanation:

On November 15, 1990 the Clean Air Act was revised in a major effort to strenghten and help ensure better compliance with the Act. The 1990 Amendments were designed to have better response to 4 threats to the environment: acid rain, toxic air emissions, urban air pollution and stratospheric ozone depletion.

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