Which passage most clearly uses an ethos appeal?

The letter C is the right option.

Explanation:

Ethos is an argument that appeals to ethics. An appeal to ethos depends on the credibility, competence and reputation of the person making the argument. A person considered as an authority on the subject she is talking about would make such an argument.

In the case of the text shown in the letter C of the question. The narrator is appealing to ethos, when he states that no information will be hidden from the nation, even if there is a delay in the delivery of the information, it will be delivered.

just took the test;

argument: "it's time to wage a war against britain to secure american freedom."

claims: "america has tried every peaceful method available for seperating from england" & "the americans' petitions to the king have been turned away by him."

answer: from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain, that this nation under god shall have a new birth of freedom, and that government of the people

explanation: