The subject-verb agreement error is corrected by using the singular verb form that matches the singular subject.
The correct sentence that fixes the subject-verb agreement error is:
A student who submits a research paper with a weak thesis and multiple sources is going to receive a higher grade than students who submit a research paper with a strong thesis and only a few sources.
This correction ensures that the subject ('a student') agrees with the singular verb forms ('submits' and 'is').
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