According to your textbook, what kind of supporting materials is used in the following speech excerpt:

Imagine this: You have spent most of the night studying for an exam. But when you get up the next morning ready to take the test, you go to your front door and it won't open. So you head to the back door, and it won't open either. You are stuck in the house. It would be pretty frustrating, wouldn't it? This is exactly the kind of frustration wheelchair-bound students feel when they can't get to class because of the snow.

hypothetical example

Explanation:Hypothetical example is a fictional example , where someone may make a story that doesn't exist but pretend as if it does exist especially when one is trying to explain a difficult subject or want to make sure that people feel the reality of a situation that is being explained. It connects people with reality of that situation. It captures people's emotions on a real level. It makes a listener actual imagine the real situation and get a real feeling of it.

because each is self-sufficient.  

answer: the sentence in the text that contains both the topic and the author's single most important idea about the topic

explanation: aww pineapple so adorable