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The question stem is phrased in a tricky manner, but it leads us towards the answer.

"the conclusion is supported if which groups of trees DID NOT show a reduction in fruit loss"

Looking back at the premise, the new pesticide SHOWED a reduction in fruit loss

In Logical terms:

New Pesticide -> Reduced fruit loss

/Reduced Fruit Loss -> /New Pesticide

AC E is incorrect. This answer choice would mean that a group of trees treated with the new pesticide did not result in a reduction in fruit loss. In logic, this could be written as New Pesticide -> /Reduced fruit loss which would go against our logic above.

AC C is correct. This answer choice shows that trees treated with the old pesticide (rather than the new one) DID NOT result in a reduction in fruit loss. This follows the logic from above: /Reduced Fruit Loss -> /New Pesticide

also interested!

I would be interested too!