“four out of five dentists recommend this type of gum,” is an example of

a. ethos
b. pathos
c. logos

The answer is B.ethos.

Let's first look into the options:

Ethos- appeal to ethics.
By using ethos, the people use authority or credibility to peesuade people.

Pathos- appeal to emotions
By using pathos, people use audience’s sympathy or empathy to persuade them, such as using stories and photos to stimulate emotions.

Logos- appeal to logic
By using facts and figures, people are persuaded to believe the reason.

In this case, ethos is used as dentists are authorities.

Hope it helps!