You can do this, i believe that you can do it :)
Answer:
C.establishing a clear purpose.
Explanation:
In the writing process, you must first understand WHAT you are writing about, and be able to let the writer know what your point is, before you can continue with your essay. Without a clear purpose, there would be no thesis, and without a thesis, you wouldn't have anything to research about. With nothing to use to research with and write the essay, then you wouldn't even need to consider the length of the text in the first place.
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Do you like this artist's style?