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: When this type of installation is performed, the SCR reactor is installed atop a steel structure that must be erected above existing equipment, such as the electrostatic precipitator. Choices:  1. The SCR reactor is always installed in the basement. 2. It is hard to install an SCR reactor. 3. The SCR reactor must be placed above existing equipment.

1