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: Limestone is the most commonly used reagent, with the quantity of its consumption depending primarily on coal sulfur levels. Choices: 1. Limestone is used the most with the amount of its use depending on coal silver levels  2. Limestone isn't used depending on sulfur levels in coal 3. Limestone is key to coal 

3