My three decades of experience in public service, my tireless commitment to the people of this community, and my willingness to reach across the aisle and cooperate with the opposition, make me the ideal candidate for your mayor:-

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.

Explanation:

c. in order of atomic number