Passage Summary: A city tried to fight the flu by telling people to wash their hands and stay home if they felt sick. When the flu season turned out to be much milder than the experts predicted, the organizers claimed the campaign was a success and that people must have listened.

Conclusion: The public followed the health campaign's advice, which led to the lower-than-expected influenza rates.

Reasoning: A campaign was launched to encourage hygiene and isolation; subsequently, the actual number of flu cases was much lower than experts had originally predicted.

Analysis: This argument makes a classic causal leap: because the campaign happened and then flu rates dropped, the campaign must have caused the drop. To strengthen this, we need to bolster that causal link or rule out alternative causes. If we found out that other factors—like a particularly warm winter or a lack of international travel—weren't the reason for the low flu rates, the campaign looks much more like the true hero. Look for an answer that eliminates an alternative explanation or shows a direct correlation between the campaign and actual behavior changes.