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: Strategies and technologies for the control of SO2, NOx and mercury emissions exist now, and improved methods are expected to become available over the next several years. Choices: 1. The emissions are expected to grow worse over the next decade. 2. These methods will include installing vacuum cleaners in the sky. 3. Better ways of dealing with emissions are predicted to arise over the next couple years.

2