Answer:
C. To list the main topics and show the order they will appear in
Step-by-step explanation:
Outlines show key words, however, they are for main topics and ideas you will write about and structure your essay in a way that makes the most sense. It is not B because an outline's purpose is not memorization; it is to plan your essay/paper. The number of sentences in each paragraph isn't typically known before writing, and outlines are done before the rough draft. C is the best answer.