Subject-verb agreement is a grammatical arrangement. The singular subject is always followed by a singular verb. Thus, option C is correct.
What are a subject and a verb?
The person or the place about whom the sentence is directed or made is the subject. The individual or location is described and elucidated in the sentence.
The verbs are the action words and form the majority of the predicate. The grammatical number of verb and subject is always the same in the agreement.
Therefore, option C. if a subject is singular then the verb will always be singular.
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