Question

what type of appeal depends on the perceived credibility or authority of the source?
emotional appeal
ethical appeal
logical appeal
multimodal appeal

Explanation:

Ethical appeal (ethos) is based on the credibility, trust - worthiness, and authority of the speaker or source. Emotional appeal (pathos) relies on emotions, logical appeal (logos) on reasoning, and multimodal appeal on multiple communication modes.

Answer:

ethical appeal