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: Other fragments and versions will add to what Callahan has assembled, not overwrite it. Choices:  1. Callahan has established a solid foundation for work in this field. 2. New findings are likely to disprove and possibly replace Callahan's work. 3. Any new information will only help Callahan's case.

2