imaru wrote:
Official Guide for GMAT Verbal Review, 2nd Edition
Practice Question
Question No.: 70
Page: 144
Difficulty:
Practice Question
Question No.: 70
Page: 144
Difficulty:
Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year. This year the plantings are being seriously damaged by bollworms. Bollworms, however, are not necessarily developing resistance to the cotton's insecticide. Bollworms breed on corn, and last year more corn than usual was planted throughout cotton-growing regions. So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.
In evaluating the argument, which of the following would be most useful to establish?
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