H D2 TS Q12 – Selective High School

When burned as fuel, ethanol emits significantly lower levels of the major pollutant, carbon monoxide, than petrol. For that reason, environmentalists claim that ethanol is a better energy source than petrol.

Which one of the following statements, if true, most strengthens the above argument?

When burned as fuel, ethanol does not release any other pollutants at higher levels than petrol. Ethanol is comparable in price to petrol. Available supplies of corn are sufficient to supply several years’ worth of ethanol. Most petrol companies already possess the technology to produce ethanol.

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Which one of the following statements, if true, most strengthens the above argument?