Read the sentence carefully. A student who submits a research paper with a weak thesis and multiple sources are going to receive a higher grade than students who submit a research paper with a strong thesis and only a few sources. Which sentence corrects the error in subject-verb agreement?

The subject of the main clause is “A student,” which is singular, so it takes the singular verb “is,” not “are.” In the comparison, “students” is plural, so the relative clause correctly uses “who submit.” Choice A makes both verbs agree with their subjects: “A student … is” and “students who submit.”

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