Which of the following best explains the cause of the trend shown in the graph for lead emissions in the United States from 1970 to 2011 ?ABy 1990, all new model cars were equipped with internal fabric filters that effectively filtered car exhaust and reduced lead emissions.BBeginning in 1975, The Clean Air Act required new cars to have catalytic converters, which effectively converted the lead found in gasoline to water vapor.CNew air-scrubber technologies were introduced in the late 1970s that effectively removed lead in the air and converted it into water vapor.DUnleaded gasoline was first introduced in 1974, and amendments to the Clean Air Act required cars with the model year 1975 or later to use only unleaded gasoline.

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