Central idea is also known as main idea. Definition: The central idea (main idea) in a piece of writing is the point that the author wants you to remember most. Some writers may state the main idea, but it is often implied, which means the reader has to make inferences (what the text says + what I know) about it.
(I think I know which poem you are talking about, because I had this on quizizz. If it's not the correct poem, I'm sorryyyy.)
Answer:
<em>"The color of your skin doesn't determine whether or not you're American."</em>
<em />
Newspaper articles is the one that makes sense to me the most.