Final answer:
Aristotle used the term ethos to refer to the concept of credibility, which is part of the rhetorical appeals in the art of persuasion.
The correct answer is option A ethos
Step-by-step explanation:
The term Aristotle used for the concept of credibility is ethos. Ethos, also known as ethical appeal, relates to the trustworthiness and authority of the speaker or writer, making them seem credible. It's integral to the art of persuasion Aristotle described, which includes rhetorical appeals such as logos, pathos, and kairos alongside ethos.
Ethical appeal often combines a speaker's character and qualifications to establish credibility with the audience. Through ethos, a speaker appeals to the audience's sense of ethics by presenting themselves as knowledgeable, reasonable, and moral.