hard · LSAT Logical Reasoning

A school district switched all of its elementary classrooms to a new phonics-based reading curriculum three years ago. This year, standardized reading scores for the district's fifth graders, who began the curriculum in first grade, are markedly higher than the reading scores posted by fifth graders in the district three years earlier, before the switch. District officials conclude that the phonics curriculum caused the improvement and recommend that neighboring districts adopt the same program.

Which one of the following, if true, most weakens the officials' argument?

  1. Several neighboring districts have reading scores this year that are comparable to, though slightly lower than, this district's newly reported fifth-grade scores.
  2. In that very same year, the very same district also went ahead and cut its elementary class sizes nearly in half by hiring far more full-time teachers districtwide.
  3. A phonics-based curriculum is entirely incapable of improving any child's reading ability whatsoever, regardless of the child's background or the school's resources.
  4. The standardized reading test given to fifth graders this year covers somewhat different material than the standardized test given to fifth graders three years ago.
  5. Parents in the district reported feeling considerably more confident about their children's reading abilities this year than they recalled feeling three years earlier.

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