medium · GMAT Verbal

Which of the following, if true, best explains this discrepancy?

1. The country's average national test scores were already ranked among the very highest in the entire world before the spending increase began.
2. The additional funding was used primarily for administrative salaries and building renovations rather than for instruction.
3. No level of public education spending whatsoever has ever had any measurable effect at all on student test scores anywhere.
4. The national school-age population grew by roughly 3% over the course of the same five-year measurement period.
5. Several neighboring countries also chose to increase their own education spending by the same 25% over these five years.

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