The correct answer is C. Credible
Explanation:
In persuasion, there are mainly three different appeals or modes of persuasion a speaker can use to convince the audience about some idea or situation, these are the logos, the pathos and the ethos, each of one addressing a different appeal or using a different technique to persuade the audience. In the case of the ethos, this mode of persuasion appeal to the authority and credibility of the speaker, which means an expert or authority's words are believed just because of the reputation and credibility the speaker has. This mode of persuasion is linked to specific values of the speaker such as competence, knowledge or expertise that made him or her someone credible or that should be believed. Considering this, the best word that describes ethos in relation to the audience appeals is "credible", because the ethos relies on the speaker credibility to persuade the audience.
