medium · GMAT Verbal
A study found that people who eat breakfast daily have lower rates of heart disease than those who skip breakfast. An author concludes that eating breakfast protects against heart disease.
Which of the following, if true, most weakens the argument?
- Skipping breakfast tends to be noticeably more common among people who hold demanding work schedules
- People who eat breakfast daily are also more likely to exercise regularly and not smoke.
- The study in question was carried out over a fairly long period of roughly ten years
- The study sample only included individuals who were over the age of fifty years
- Some people who faithfully eat breakfast every single day nonetheless develop heart disease
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