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Q1
After City X installed new protected bike lanes last spring, the number of reported vehicle collisions declined by 15 percent compared to the previous year. Therefore, the lanes reduced collisions citywide. Officials note that the bike-lane project spanned all major corridors and was completed before the comparison period began.
Which one of the following, if true, most seriously weakens the argument?
Which one of the following, if true, most seriously weakens the argument?