Answer:
D. A sidebar is a short piece of text that provides information about a sub topic in a non fiction article.
Step-by-step explanation:
A Side bar can be a short article in a magazine placed in a narrow area which provides additional relevant and related information's. it is usually next to a longer article in a newspaper or on websites and contains explanatory material. Most professional pages include side bars, it started in the world of printed newspapers then moved alongside newspapers and news platforms.
Side bar can also mean a court room conversation between lawyers and the judge which the members of the jury will not hear.