Marcia Is Generating Main Ideas for Her Speech on Film

Marcia is generating main ideas for her speech on film genres.She naturally thinks of genres such as horror,westerns,and romantic comedies.She is using which tip for the generation of main ideas?

A) Think of logical divisions.
B) Think about reasons why the central idea is true.
C) Break the central idea down into a chronological sequence.
D) Use direct,specific language.