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: Then, when the groups learned of one another's existence, the boys immediately drew lines in the sand. Choices:  1. The groups learned to work together.  2. The boys hated the girls.  3. The group learned that the other existed and started a divide. 

1