Environmentalist: Pollution from gasoline burned by cars contributes to serious environmental problems. But the cost of these problems is not reflected in gasoline prices, and hence usually does not affect consumers' decisions about how much to drive. Heavier taxes on gasoline, however, would reflect this cost, and as a result consumers would pollute less. The environmentalist's statements, if true, most strongly support which one of the following? ['The cost of pollution from driving should not be reflected in the price of gasoline unless the amount of pollution produced would be reduced as a result.', 'The only cost considered by most consumers when they are deciding how much to drive is the cost of gasoline.', 'Consumers would purchase less gasoline, on average, if the cost of the environmental problems to which pollution from driving contributes were fully reflected in the price of gasoline.', 'Pollution from gasoline burned by cars will be reduced only if consumers give more consideration to the cost of that pollution when deciding how much to drive.']