medium · LSAT Logical Reasoning

A recent observational study found that people who drink green tea daily have a lower risk of heart disease. The study's authors concluded that green tea consumption prevents heart disease.

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

  1. Daily green-tea drinkers are also far more likely to engage in regular cardiovascular exercise.
  2. Green tea contains potent antioxidants shown in trials to improve the functioning of blood vessels.
  3. Green tea generally costs considerably more per individual serving than many other common herbal teas.
  4. The observational study tracked a very large group of participants closely over a full decade.
  5. Green tea consumption also correlates with a modestly lower measured risk of several specific cancers.

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