Marius plans to give a speech to convince his audience to vote in the upcoming campus elections. What is the general purpose of marius's speech?

Marius aims to modify the behaviour of his campus mates, therefore he is using an argumentative speech.

This instrument allows to express the speaker's opinion together with several arguments to support its main ideas and to make the others agree with the opinions displayed. In order to so, is important to approach the audience speaking about the benefits of the position defended over others.