Final answer:
The correct answer to the question is c. Ethos, which refers to the ethical appeal that establishes the speaker's credibility and trustworthiness.
Step-by-step explanation:
According to Aristotle, one of the three ways a speaker can demonstrate their character and create ethos is through the presentation of a believable, authoritative voice that elicits an audience's trust. Ethos often invokes the speaker's character and qualifications on the subject, thereby establishing credibility with the audience. Thus, the correct answer is c. Ethos. The other two appeals are logos, which is an appeal to logic and reason, and pathos, an appeal to emotions and feelings shared by an audience. These three elements are fundamental to the art of persuasion and can be used strategically to influence the audience's perspective.