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Original question phrased as: "There have been a number of ideas proposed for how governments can reduce the emissions of greenhouse gases. For each of the following policy options I read please indicate if you strongly support, somewhat support, somewhat oppose, or strongly oppose that option.”

(Version A) “Putting a price on carbon pollution.”
(Version B) “Putting a price on carbon pollution that would increase the price of gasoline by [2 cents per liter/8 cents per gallon].”
(Version C) “Putting a price on carbon pollution that would increase the price of gasoline by [11 cents per liter/42 cents per gallon].”