A call to ethos is a call to credibility. When writers employ their own expertise on a topic or mention an expert on the issue, they deploy ethos.
How does ethos appeal to the audience?
Ethos is the process of persuading your audience that you have excellent character and are credible so that your words can be trusted. Ethos must be established from the beginning of your presentation or the audience will reject what you say.
Indeed, ethos is frequently created prior to your presentation; for example, you may be the CEO of the firm to which you're presenting, so you're already recognized as a specialist.
Thus, Option B is the correct Option.
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