Read this sentence from the main text: We tend to not like mucus because it is a considered a symptom or sign that something is wrong. What purpose does this sentence serve in the text as a whole? (1 point)
A. It explains the main point of the discussion of why mucus is important. B. It introduces another reason to like meycus.
C. It introduces the quotation from Dr. Johns.
D. It provides an explanation of our reaction to mucus.

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