Look at the different emission levels in the bar graph below. What BEST accounts for these differences in emissions? 
A) The Clean Air Act of 1970 along with the updates and amendments of 1977 and 1990
B) The use of electrostatic precipitators in coal burning power plants
C) The development of "superclean" cars that do not emit any nitrogen oxides and hydrocarbons.
D) The use of lead free and cleaner-burning gasoline.
Correct Answer:
Verified
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