Question ID:PT45 S4 Q7 Passage:A typical gasoline-powered lawn mower emits about as much air-polluting material per hour of use as does an automobile.  Collectively, such mowers contribute significantly to summer air pollution.  Since electric mowers emit no air pollutants, people can help reduce air pollution by choosing electric mowers over gasoline ones whenever feasible. Stem:Which one of the following, if true, provides the most support for the argument? Correct Answer Choice:CChoice A:Lawns help to clean the air, replacing pollutants with oxygen. Choice B:Electric lawn mowers are more expensive to purchase and maintain than are gasoline mowers. Choice C:Producing the power to run an electric mower for an hour causes less air pollution than does running an automobile for an hour. Choice D:Most manufacturers of gasoline lawn mowers are trying to redesign their mowers to reduce the emission of air pollutants. Choice E:Lawn mowers are used for fewer hours per year than are automobiles.