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OG2016 CR Practice #86.
Scientists have modified feed corn genetically, increasing its resistance to insect pests. Farmers who tried out the genetically modified corn last season applied less insecticide to their corn fields and still got yields comparable to those they would have gotten with ordinary corn/Ordinary corn seed, however, costs less, and what these farmers saved on insecticide rarely exceeded their extra costs for seed. Therefore, for most feed-corn farmers, switching to genetically modified seed would be unlikely to increase profits. Which of the following would it be most useful to know in order to evaluate the argument?
Whether there are insect pests that sometimes reduce feed-corn yields, but against which commonly used insecticides and the genetic modification are equally ineffective
Whether the price that farmers receive for feed corn has remained steady over the past few years
Whether the insecticides typically used on feed corn tend to be more expensive than insecticides typically used on other crops
Whether most of the farmers who tried the genetically modified corn last season applied more insecticide than was actually necessary
Whether, for most farmers who plant feed corn, it is their most profitable crop

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