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: For example, to achieve 80 percent mercury reduction from a low sulfur bituminous coal using an ACI system with humidification will require a treatment rate of about 8 lb/million acf (MMacf). Choices: 1. Mercury levels can be reduced from bituminous coal with an ACI system. 2. This system is very expensive to install and operate. 3. There is no way to achieve more than a 20% reduction in mercury levels.

2