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: But LSC quickly began to prove we were serious about planning. Choices:  1. We could have proved that we were serious about planning otherwise, but LSC thankfully did it for us. 2. LSC was able to show that we weren't taking planning lightly. 3. LSC didn't think we took planning seriously, so they chose not to affiliate themselves with us.

3