6) B

The argument is that “our health is at much greater risk from natural pesticides than from synthetic ones.”

A – Wrong
This actually strengthens the argument as it says natural pesticides can harm animals (humans are also animals).

B – Correct
This weakens that argument. If humans have become tolerant of such natural pesticides, then they cannot harm us, meaning our health will not be at greater risk.

C – Wrong
This again strengthens the argument. The last line suggests that we consume a vast amount of natural pesticides compared to synthetic ones. C states that natural pesticides can be harmful.

D – Wrong
This is not relevant for the argument which states natural pesticides can harm us.

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