Them would be the correct pronoun for this sentence because books is plural and is an object, so its pronoun must be third person. The 3rd person plural pronoun in English is they, and its objective/accusative form (the form used when the item is the object of a verb) is them, so there's your answer.
When considering shift, a writer should consider point of view, verb tense, mood and voice and shifts from indirect to direct questions or quotations.
<h3>What is shifting in writing?</h3>
Shifting in writing is the shifting of tense, or other grammar actions, that modified the writing and enhance the sentence or paragraph.
Thus, the correct option is A. Shifts from indirect to direct questions or quotations.
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