Passage Summary: An advertisement claims that because fit people exercise and cereal eaters exercise, you can become fit just by eating their specific brand of cereal.

Conclusion: Eating Fantastic Flakes every morning will put you on the most effective path to becoming physically fit.

Reasoning: Exercise is the best way to get fit, and data shows that people who eat cereal daily exercise more often than those who do not.

Analysis: The flaw here is a classic case of confusing correlation with causation. The ad notes a correlation between cereal consumption and exercise frequency, then concludes that eating cereal will lead to fitness. It ignores the possibility that a third factor—such as a general interest in health—causes people to both eat cereal and exercise. We should look for an answer that points out the argument's failure to prove that eating cereal actually causes the increase in exercise or fitness.