Answer:
The type of oratory that is usually persuasive is a speech. While all of the options listed can be used to convey a message or communicate information, a speech is typically intended to persuade an audience to take a specific action or adopt a particular point of view.
A lecture, for example, is typically more informational and educational in nature, whereas a song or narrative address may be more focused on entertaining or inspiring an audience. While a speech can certainly include elements of entertainment or inspiration, its primary purpose is to persuade the audience to take a specific course of action or to adopt a particular viewpoint.