How does the author use ethos in the passage

The author uses ethos in the passage by quoting a public figure to establish credibility. Therefore, Option D is correct.
In Greek, ethos means "custom" or "character". It was originally used by Aristotle and referred to a man's character or personality. In present times, ethos is used to refer to the practises or values that distinguish one person, organization, or society from others.
When it comes to speech or writing, ethos is used to sound fair or demonstrate expertise, education, or pedigree. A few of the examples of ethos are: As a doctor, I am qualified to tell you that this course of treatment will likely generate the best results.
Therefore, Option D is correct.
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