Question

which rhetorical appeal is primarily used in this ad? studies show that duophase clinical strength toothpaste is 96% as effective as a professional dental cleaning. ethos (character) logos (reason) pathos (emotion)

Explanation:

The ad uses "Studies show" and a percentage ("96%") to present factual information about the toothpaste's effectiveness. Logos is an appeal to reason, using facts and data.

Answer:

logos (reason)