Final answer:
Speakers should use examples to justify an opinion and avoid fallacies like slippery slope, ad hominem attacks, and circular reasoning.
Explanation:
When justifying an opinion, a speaker should use examples to support their viewpoint. Using examples helps to make the opinion more convincing and provides concrete evidence for the argument. Resorting to slippery slope fallacies, ad hominem attacks, or circular reasoning can weaken the speaker's argument by introducing flawed logic or personal attacks.
Learn more about Justifying an opinion using examples here:
https://brainly.com/question/41624751
