Cars fueled by methanol have a much lower level of emissions

Which of the following, if true, provides the most logical completion of the passage below?

Cars fueled by methanol have a much lower level of emissions of pollutants such as carbon monoxide and environmentally harmful hydrocarbons than gasoline-fueled cars do. Methanol fuel does produce somewhat higher formaldehyde emissions than gasoline does. Nevertheless, a methanol-powered car actually produces less atmospheric formaldehyde pollution than a comparable gasoline-powered car, because _______.

(A) compared to carbon monoxide and some hydrocarbons produced by gasoline-powered cars, formaldehyde pollution is not a serious threat to the environment
(B) the technical difficulties involved in mass-producing methanol-powered cars will prevent them from seriously competing with gasoline-powered cars for several years
(C) gasoline-powered cars are required by United States law to be equipped with catalytic converters that reduce emissions of many pollutants
(D) measuring a car's emissions is generally an accurate method of assessing that car's contribution to atmospheric pollution
(E) most formaldehyde pollution generated by gasoline-powered cars results from the photochemical conversion of hydrocarbon emissions into formaldehyde in the atmosphere


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