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: These uncertainties can be reduced by careful consideration of the differences in the health risk or air pollution commodity and the study populations in the underlying economic literature versus the context of benefits conferred by the Clear Skies Act. Choices:  1. There is no way to reduce these uncertainties at this time. 2. Careful observation and studying of health risks by air pollution can help ease uncertainties.  3. The risk of air pollution is the most important type of pollution which should be carefully considered. 

1