Option D, Nine out of 10 dentists agree that Mike's Floss is effective, is the best example of pathos as it appeals to emotions through expert opinion.
The best example of pathos in the given options is D. Nine out of 10 dentists agree that Mike's Floss is effective. This statement appeals to the audience's emotions by creating a sense of trust and credibility through the use of expert opinion, which can evoke a positive emotional response.
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