Question

9) An author's _ _ _ _ _ _ _ could be to inform, to entertain, or to persuade.

Answer 1

An author's purpose could be to inform, to entertain, or to persuade

The answer is purpose

Answer 2

Purpose...
It’s depending on the article you are ready whether it’s informative, entertainment or persuasive.
-Informative articles is to inform you about something i.e. inform you about merits of mobile phones
-Entertainment is to entertain you i.e. entertain you about the latest music
-Persuasive articles are to persuade you to do something i.e. persuade you to buy mobile phone

Hope this helped you..