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: Influenced by the psychoanalyst Bruno Bettelheim's research showing that the Nazi concentration camps infantilized their inmates, Elkins argued that the closed system of slavery was so cruel and all-encompassing that none but the most stouthearted could survive without their wills being broken or their psyches damaged. Choices: 1. Bettelheim researched Nazi concentration camps for thirty years. 2. Bettelheim researched Nazi concentration camps. 3. Bettelheim researched Japanese interment camps.

1