Organizational pattern here refers to a way of organization written document. There is numerous type of these, depending on the type of document you are making. Some examples include topical pattern, where you write your document by starting with a description of the topic you are presenting, to causal pattern, where you present your writing in order to explain how a phenomenon occurs and why it happened in such a manner.
Thus, the best answer for the given question is (C) your readers’ expectations.
