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With “neither…nor,” verb agrees with the nearer subject. Here “students” (plural) requires “were.” Choice A correct. Choice B wrongly uses singular “was.” On PSAT, agreement follows the subject closest to the verb.

Use Pythagoras: 7²+b²=25² →49+b²=625 →b²=576 →b=24. Choice C correct. Recognizing 7–24–25 triple helps. PSAT geometry often uses special triples.

“However” introduces a counterpoint—growth vs. inequality. Choice C correct. Other options misinterpret. PSAT often tests awareness of pivot words.

The contrast between “limitations” and “potential applications” shows that while imperfect, the experiment still mattered. Choice B matches. A and C contradict the passage, D ignores its focus. On PSAT inference, balance both halves of contrast sentences.

“Group” is singular, so verb = “is.” Choice A correct. Other options misuse agreement. On PSAT, collective nouns (“team,” “class,” “group”) usually take singular verbs unless context stresses individuals.