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This item targets subject–verb agreement and correlative conjunctions—core conventions assessed on the PSAT. With “neither…nor,” the verb agrees with the noun closest to it (the subject immediately following “nor”). Here, “project lead” is singular, so the verb must be singular: “was.” Choice A correctly uses “nor” and matches the verb to the singular subject. Choice B keeps correct “nor” but uses “were,” a plural verb, mismatching the singular “project lead.” Additionally, “testing” vs. “tests” is stylistic; both are acceptable, but subject–verb agreement is the tested rule. Choice C incorrectly pairs “neither…or” (should be “neither…nor”) and, while “was” is singular, the correlative is wrong. Choice D fixes agreement (“was”) and “nor” but introduces the ungrammatical singular “test” after “additional,” which calls for a plural or a mass noun (“tests”/“testing”). On PSAT Conventions questions, identify the true subject and the controlling correlative structure, then ensure the verb matches in number. When “neither…nor” or “either…or” appears, always check the subject closer to the verb.