One provision of the Clean Air Act of 1970 required cities in which smog was still a problem, despite emissions controls placed on new cars, to impose rules restricting the public's use of cars. Why did this provision fail?
a. The EPA adopted an overly zealous command-and-control strategy.
b. The provision was ruled unconstitutional.
c. Powerful client groups worked to defeat the provision.
d. Public opposition was too great.
e. Legislators vowed to strengthen the measure if there were not immediate results.
Answer: D
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