Which main component of rhetoric addresses a speaker’s credibility?
a. pathos
b. nithos
c. ethos
d. logos

The correct answer is option c "ethos". Among the rhetorical appeals used in speeches and literature to persuade an audience, ethos is the one that address to a speaker’s credibility. In this mode of persuasion the speaker use the authority or credibility of an expert or celebrity to positive influence in the audience.

obama was told in early july 2004 that he was chosen to deliver the address, and he largely wrote the speech himself, with later edits from the kerry presidential campaign.

no, i never do because that’s not the reason for what i speak to or of.