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Comprehensive and Detailed Explanation:

The correct answer is B. The subject of the sentence is “each,” which is singular. Therefore, it requires the singular verb “has.” The phrase “of the students” does not change the number of the subject. Because “each” refers to individual members of a group, the verb must remain singular.

Choice A is incorrect because “have” is a plural verb and does not agree with the singular subject “each.” Choice C is incorrect because “were” is also plural and creates a subject-verb agreement error. Choice D contains both a subject-verb agreement error and an incorrect verb form.

Writing objectives for THEA focus heavily on grammar, sentence structure, usage, and effective written communication. Subject-verb agreement is one of the most frequently tested concepts. Students often become confused when a singular subject is separated from its verb by a prepositional phrase such as “of the students.” A useful strategy is to identify the true subject before choosing the verb. In this sentence, the true subject is not “students” but “each.” Recognizing the actual subject helps writers avoid common agreement errors and produce grammatically correct sentences that clearly communicate their intended meaning.