Final answer:
Ethos is the rhetorical proof that an individual fulfills when they aim to be a competent, trustworthy, and dynamic speaker.
Step-by-step explanation:
To be a competent, trustworthy, and dynamic speaker, an individual is fulfilling ethos - the presentation of a believable, authoritative voice that elicits an audience's trust. Ethos establishes the credibility and expertise of the speaker, making the audience more likely to trust and believe what they say. In the case of a speaker, it is important to establish ethos by demonstrating knowledge and expertise in the subject matter.