medium · GMAT Verbal

Which of the following, if true, identifies a flaw in the researcher's reasoning?

1. The pesticide costs considerably more per acre to apply than the traditional chemical alternatives now sold widely.
2. A separate university study found that the pesticide is moderately harmful to several local songbird populations.
3. No pesticide ever applied in any agricultural setting has been shown to reduce a target insect population at all.
4. Insects that survived the treatment are likely to pass resistance to their offspring.
5. The insect population in neighboring fields where no pesticide was used also fell by 40% over the same period.

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