My two years of experience as your vice president, mt tireless commitment to the students of this school, and my willingness to be your voice and represent you when meeting with the school authorities make me the ideal candidate for senior class president which of these rhetorical devices is most clearly used here?

Based on the excerpt of the student's speech, it can be said that the rhetorical device being used is "Ethos". The excerpt is trying to make an appeal to ethics. The speaker is trying to establish his credibility by making enumeration of what he has done and what he can do. He is trying to convince the audience of his character and his capability.