Read the following paragraph; then identify the organizational pattern that describes it. Sometimes it may use more than one organizational pattern, in this case, choose the one pattern that seems to dominate the paragraph. Preparing an effective speech requires intelligent planning. You must first select a topic; brainstorming often helps you to focus on what you want to say. Then you need to study who your audience will be to determine how you want to present your material. Then, once you have determined a topic and analyzed your audience, you are ready to do careful research on this topic.
选项：

A: Process analysis;
B:Space relationship;
C:Comparison and contrast;
D:Definition