The way the author's use of syntax contributes to the tone of the excerpt is C. Sentence length helps to develop a neutral tone.
This refers to the author's attitude in a given story and how this affects the mood of the story.
Hence, we can see that from the given excerpt, there is the narration of the issues black women face and how science has found that they have a higher risk of getting cancer.
Therefore, we can see that option C is the correct answer.
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