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Robert Carroll wrote: ↑Wed Dec 22, 2021 11:25 am BMM2021,
You're missing that answer choice (C) says "certain pest populations". So your hypothetical that the author may have a different opinion about different pests is irrelevant - we need the conditional to apply to at least one pest population for this answer choice to be supported. You're conceding that it applies to the mites in the passage. That's good enough to prove it.
Insecticides Predators workThat is, if insecticides are used, then this should be because predators haven't worked. This could also be diagrammed as:
Insecticides Predators workIn other words, insecticides should never be used if predators work. Note that this is not saying the following:
Predators work InsecticidesIt is not saying that if predators don't work, then use insecticides.