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: Colonizing other worlds would be the ultimate adventure. Choices: 1. There'd be no way to top the adventure that comes with colonizing other worlds. 2. Colonizing other worlds wouldn't be much of an adventure. 3. Fighting resistant alien populations would be just one of many challenges.

3