Definition: In this task, you're given a statement and three sentences as choices. Your job is to determine the neutral choice based on your inference from the statement and your commonsense knowledge. The neutral choice is a sentence that neither agrees nor disagrees with the statement. Indicate your answer as '1', '2', or '3', corresponding to the choice number of the selected sentence. If sentence X agrees with sentence Y, one's correctness follows from the other one. If sentence X disagrees with sentence Y, they can not be correct at the same time.
Input: Statement: Until gas costs more, consumers won't pay the premium for enviro-friendly vehicles. Choices: 1. Consumers will drive SUVs unless gas prices go up.   2. Consumers will buy economy cars even if the gas price is low.   3. Consumers will not pay extra for economy cars unless gas prices go up.  

1