In your persuasive essay, each reason that you give within the body should be followed by

I would say "evidence" or "examples." if you offer a reason in a persuasive essay without any sort of anecdote or illustration, you aren't really giving anything for your audience to grab onto and remember. reasons within essays can't be unfounded, either, so that's why i'd say evidence--you have to prove your ideas or beliefs in a persuasive work.