Assessment Item 54 close window

The Clean Air Act of 1970 set broad national goals for the reduction of air pollution.

Which of these was a direct result of this act?
 
Fake Radio Button   F     Prices of automobiles declined.
Fake Radio Button   G     Fewer automobiles traveled on highways.
Fake Radio Button   H     Automobile makers redesigned automobile engines.
Fake Radio Button   J     Automobile smog problems were eliminated.
 
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