You can include more sophisticated words which enrich your work also make sure your work is aimed at an audience you think your book is for.
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D) My sister, who exercises every day, is coming over for dinner.
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uhm we need more context to anwser this question
Explanation: Indirect characterization is the author uses actions, thoughts, and speech, to show the reader who character is. For example: Tracy had said quietly, "you'll change, whether you think you will or not