medium · GMAT Verbal
A researcher observes that students who eat breakfast every morning have higher test scores than those who do not, and concludes that eating breakfast causes improved academic performance.
Which of the following, if true, most weakens this conclusion?
- Eating breakfast is the single most important factor in any student's academic success
- The school cafeteria recently improved the nutritional quality of its breakfast menu
- Students who eat breakfast also tend to keep more consistent sleep schedules and study habits
- Most students reported enjoying the breakfast options provided by the school
- A separate study found that drinking water also correlates with higher concentration levels
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