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: 'I don't understand.' Choices:  1. Only some things are understood and others are not.  2. Everything is understood perfectly.  3. There isn't anything understood. 

2