Read this excerpt from Ray Bradbury’s commencement speech.

And then you gather around you the people who do believe in you—your parents and a few friends, if you're lucky. We don't have many friends in this world; but the few that do believe in you—and then you move on into the future. I try to do that.

What element of persuasion does Bradbury use in this excerpt?

a connection with the audience
researched facts that prove a point
a statement of purpose
examples to support an argument