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The verb which best completes the sentence as given in the task content is; Choice C; earns.
Agreement of subject and verb of a sentence
From concord, it follows that singular subjects attract singular verbs and plural subjects attract plural verbs.
On this note, the subject of the sentence given is; Each which connotes a singular meaning. Hence, the appropriate verb for the sentence is the singular verb; earns.
Read more on subjects and verbs;
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