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: It does, however, explain the similarities and differences among the six kinds of case study and discusses ideas for successfully designing them. Choices: 1. It doesn't really help tell the differences between the various case studies. 2. The six types of case studies are vastly different from one another. 3. It effectively compares and contrasts the six kinds of case studies.

2