When a relative pronoun (which, who, that) is used to introduce a dependent clause, the number of the verb must agree with the pronoun's antecedent.
This is one of the reports that are required for this project. (The relative pronoun that takes the plural verb [are] because its antecedent [reports] is plural. To test this type of sentence, read the of phrase first: Of the reports that are…)
(From Write for Business, page 324, and Proofreader's Guide PDF, page 74)
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