Ethanol is a derivative of corn and other grains. When burned as fuel, it emits significantly lower levels of carbon monoxide, a major atmospheric pollutant, than does gasoline. For that reason, environmentalists claim that ethanol is a better source of energy than gasoline.
Which of the following, if true, most strongly supports the environmentalists' claim?
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AWhen burned as fuel, ethanol does not release any pollutants at higher levels than does gasoline.
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BEthanol is comparable in price to gasoline.
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CAvailable supplies of corn are sufficient to supply several years' worth of ethanol.
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DMost gasoline companies already possess the technology to produce ethanol.
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EEthanol can be used as heating fuel.
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正确答案: A