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Passage: 'Cities that have introduced congestion charges in their central business districts have seen reductions in air pollution. Therefore, our city should also introduce congestion charges to reduce pollution.' Which, if TRUE, MOST strengthens the argument?

ACars used to be smaller in those cities
BAir quality is a topic of public concern
CPollution reductions in cities with congestion charges have been consistently attributed by independent studies to reduced traffic volumes within the charged zone, with effects sustained over multiple years
DCongestion charges generate municipal revenue
Answer & Solution
Correct answer: C. Pollution reductions in cities with congestion charges have been consistently attributed by independent studies to reduced traffic volumes within the charged zone, with effects sustained over multiple years
Independent attribution + sustained effect closes off rival explanations. The strengthen item must add evidence specifically connecting the charge to the cause-and-effect, not the desirability of the goal.
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