medium · LSAT Logical Reasoning
A nutritionist observed that participants who began drinking green tea daily reported significant improvements in their sleep quality. The nutritionist concluded that the antioxidants in green tea cause better sleep.
Which one of the following, if true, most seriously weakens the argument?
- People disciplined enough to drink green tea every day are also more likely to keep a consistent nightly sleep schedule
- People who never drink green tea or any caffeinated beverage at all also report consistently high-quality sleep
- Some people who avoid green tea and every other caffeinated drink still report consistently restful nightly sleep
- Green tea contains small but real amounts of caffeine, a stimulant well known to disrupt the onset of sleep in some people
- The study deliberately drew its participants from a broad range of different age groups, occupations, and geographic regions
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