medium · GMAT Verbal

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

1. The students who took part generally reported that they had enjoyed the tutoring sessions.
2. No other change to the math curriculum or teaching staff occurred at Lincoln High during that year.
3. Reading scores at Lincoln High, on the same standardized assessment, also rose by a comparable margin that year.
4. Math scores rose by a closely similar amount in a neighboring district that had introduced no tutoring program.
5. The new tutoring program turned out to be fairly costly for the school to design, staff, and implement that year.

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