medium · GMAT Verbal

In districts where intestinal worms are common, a charity dewormed all schoolchildren for two years. Treated children missed fewer school days than before. Yet a decade later, their adult earnings were no higher than those of children in nearby untreated districts.

Which of the following is most strongly supported by the information above?

  1. Reduced school absence among the treated children did not translate into measurably higher adult earnings.
  2. Deworming treatment has no effect at all on the health of schoolchildren in any district whatsoever.
  3. The treated children would have earned even less money as adults had they never been dewormed at all.
  4. Attending school for more days never improves a person's future adult earnings in any setting whatsoever.
  5. Untreated children in the nearby districts missed considerably more days of school than the treated children did.

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