GMAT Verbal Reasoning Practice Test 2

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Question : 2 of 101
 
Marks: +1, -0
The number of young adults that are illiterate has dropped significantly in a certain county over the last fifteen years. Education officials attribute this decrease entirely to improved conditions in the schools, which made for a better teaching environment, reducing the level of illiteracy.
Which of the following, if true, would most seriously weaken the education officials’ explanation for the lower incidence of the disease?
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