It is D. because you want to know what the paper is about, that way you don't confuse your readers. You also want to ask who will be reading it that way you know what else to include in your paper. Like let's say you are writing about the blue jay and you know that your teacher will be reading it so you put in some interesting-but true- facts. You also want to ask what the purpose is because if it is a fiction then you can make things up but if it is non-fiction then you have to make sure all of your facts are true.
