Question ID:PT29 S4 Q1 Passage:Combustion of gasoline in automobile engines produces benzene, a known carcinogen.  Environmentalists propose replacing gasoline with methanol, which does not produce significant quantities of benzene when burned.  However, combustion of methanol produces formaldehyde, also a known carcinogen.  Therefore the environmentalists' proposal has little merit. Stem:Which one of the following, if true, most supports the environmentalists' proposal? Correct Answer Choice:DChoice A:The engines of some automobiles now on the road burn diesel fuel rather than gasoline. Choice B:Several large research efforts are under way to formulate cleaner-burning types of gasoline. Choice C:In some regions, the local economy is largely dependent on industries devoted to the production and distribution of automobile fuel. Choice D:Formaldehyde is a less potent carcinogen than benzene. Choice E:Since methanol is water soluble, methanol spills are more damaging to the environment than gasoline spills.