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: Whether the northern tribes made the pass difficult to defend by their constant raiding is still debated by scholars, but it is known that the local inhabitants weren't willing to give the Romans free rein over the whole territory. Choices: 1. Romans engaged in war to take over the territory. 2. Scholars are still debating whether the northern tribes raided to make the pass difficult to defend. 3. Scholars are certain that northern tribes made the pass difficult to defend by their constant raiding.

1