medium · LSAT Logical Reasoning
A city study observed that neighborhoods with a high density of public parks also had significantly lower rates of respiratory illnesses among residents. The city planners concluded that the trees and plants in these parks improve air quality, which in turn leads to better respiratory health for the local population.
Which one of the following, if true, most seriously weakens the city planners' argument?
- Residents of these park-dense neighborhoods reported spending more time exercising in the parks than residents elsewhere.
- The neighborhoods with the most parks are also those with the least industrial activity and heavy truck traffic.
- No respiratory illness can ever be fully cured once a patient has been diagnosed.
- The cost of maintaining the city's public parks has risen twenty percent over the past decade because of higher labor costs.
- Air-quality monitoring stations are positioned closer to parks than to other parts of these neighborhoods.
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