Answer:
C). Appeal to ethics.
Step-by-step explanation:
Audience or the readers are of supreme importance for a speaker or author and they attempt to put in every possible effort to persuade them either by appealing to their emotion, reason(logic), ethics, etc. Aristotle, the famous Greek philosopher proposed three modes of persuasion including ethos, logos, and pathos.
In this passage from the Declaration of Independence where Jefferson employs 'ethos' that implies 'an appeal to ethics' to convince the readers by invoking the authority or expertise to establish their credibility among the readers. This technique implies an argument that seems correct(appeals to their ethics) and persuades the audience to believe in the author's argument. Thus, option C is the correct answer.