Given the task definition and input, reply with output. In this task, you're given a statement and three sentences as choices. Your job is to determine which sentence can be inferred from the statement. Incorrect choices change the meaning in important ways or have details that are not mentioned in the statement. Indicate your answer as 1,2, or 3 corresponding to the choice number of the selected sentence.

Statement: An SCR system for a coal-fired boiler may have a negligible impact on the footprint of the boiler. Choices: 1. The footprint of the boiler may be changed negligibly by an SCR system. 2. SCR systems always have a large footprint in relation to boiler size. 3. SCR systems with smaller footprints are generally more expensive to install.
1