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: Based on the estimated time periods needed to complete each of the four phases described above, the estimated time period to complete the implementation of ACI on one combustion unit is about 15 months, as shown in Exhibit A-5 in Appendix A. Since the permitting process limits the timeline, a faster permitting process will shorten the time necessary to install ACI on a single unit. Choices: 1. There is no guarantee that the implementation will be done by that time. 2. the time period to complete the ACI implementation is an estimate. 3. The time stated for completion is precise to the day.

1