medium · LSAT Logical Reasoning

A recent study observed that city residents who live near public parks report significantly lower stress levels than those who do not. The researchers concluded that the presence of green space directly improves the mental well-being of urban populations.

Which one of the following, if true, most seriously weakens the researchers' conclusion?

  1. People who already lead calm, health-conscious lives tend to seek out and choose homes located near public parks.
  2. Many residents who live far from any park nevertheless report low stress because of other features of their lifestyles.
  3. The study did not record which specific activities residents pursued during their visits to the parks.
  4. The cost of maintaining public parks has climbed steadily in most large cities over the past decade.
  5. Public parks are by far the most powerful tool any city has for improving the mental health of its residents.

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