Definition: In this task, you're given a statement, and three sentences as choices. Your job is to determine which sentence clearly disagrees with the statement. Indicate your answer as '1', '2', or '3' corresponding to the choice number of the selected sentence.
Input: Statement: First, the CEF analysis was benchmarked to a 1999 reference case. Choices:  1. The CEF analysis was benchmarked to a 1999 reference case. 2. The CEF analysis was not compared to any other case. 3. The 1999 case showed better performance in comparison.

2