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: Regardless of where the SCR reactor is located, ductwork from the economizer outlet to the SCR reactor and back to the air preheater inlet must be accommodated. Choices: 1. The SCR reactor is almost always located on the back. 2. The ductwork from the economizer outlet to the SCR reactor and back doesn't need to be accommodated. 3. Ductwork from the economizer outlet to the SCR reactor and back to the air preheater inlet must be accommodated, it doesn't matter where the SCR reactor is.

1