Passage Summary: Even though some pesticides are banned in the U.S., we still sell them to other countries. Those countries use them on food they send back to us, which makes U.S. consumers sick.

Conclusion: Exporting banned pesticides to other countries significantly increases the health risks faced by U.S. consumers.

Reasoning: These exported pesticides are used on crops in other countries, which are then imported back into the United States for consumption.

Analysis: The columnist assumes a causal link: if the U.S. stops exporting these pesticides, the health risk to U.S. consumers will drop. To weaken this, we need to find a reason why stopping the exports wouldn't help. For instance, if those other countries could easily buy the same pesticides from a different country, the risk to U.S. consumers would remain exactly the same. Look for an answer that suggests the U.S. export ban would be ineffective at changing the actual usage of these chemicals abroad.