What is your "task" when writing?
a. what the audience knows
b. what your assignment is
c. what your goal is

When writing, your task as a writer is to know what your goal is. Writing is another way of conveying messages to your readers. You should always remember that your goal is to convince or persuade your readers about what your topic is all about. In addition, writing could be another way to impart important ideas or new information to your readers. Readers would find it uninteresting if they already know what it is all about. The readers are your target so your goal is for the readers. So the answer is Letter C.