Answer: B. He tells the audience that if they listen closely, they will know that he is honorable and speaks the truth.
An appeal to ethos is one that tries to persuade the audience by appealing to the ethical qualities of the speaker. It tries to highlight the credibility of the speaker in order to motivate listeners to believe his or her words. In this case, Brutus is trying to persuade the audience of his position by claiming that he is honorable and he speaks the truth.