Congress has passed a law that scales back the tax credits offered to purchasers of hybrid cars. Because of this, the number of hybrid cars sold each year, which has approximately doubled in each of the last five years, is likely to flatten in the next few years. Which of the following statements, if true, most weakens the conclusion that the number of hybrid cars sold annually is likely to flatten in the next few years? ['Manufacturers have significantly increased their budgets for advertisements touting the fuel efficiency of hybrid cars.', 'Hybrid vehicles have a reputation for having less power than comparable non-hybrid vehicles.', 'Most people buy hybrid cars for reasons other than to save money in the long run.', 'Gasoline prices are projected to fall over the next few years.']