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Answer:
Decreased use of pesticide.
Explanation:
If there is only one answer the one above^ is the one that I would go with.
The questions asks about a GMO that makes a plant less appealing to insects and is more resilient to weed killing chemicals. Because it is less appealing to bugs to eat, there would be less of a need for pesticides. Personally, I do not feel as though there is enough evidence in the question to draw a conclusion on the other answers provided.