A writer should use a reciprocal pronoun when

Use a reciprocal pronoun, such as “each other” or “one another,” when two or more people or things act on or relate to one another. In this case, the subjects are also objects of the action, so choice B, “two or more subjects of the sentence are also objects,” is correct. Reciprocal pronouns do not add emphasis or function as the sentence’s main subject.

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