Which behavior is most clearly a response to a rhetorical situation? a. doing research on the topic of a speech b. organizing a speech by topic c. editing a speech to make it more formal d. backing up facts in a speech with evidence

The correct option is C.
The art of public speaking is called rhetoric. The circumstances or conditions in which one give a speech or a presentation is called a rhetorical situation.
A rhetorical situation has three important elements, which are a text, an author and an audience. Editing one's speech to make it more presentable is a rhetorical behavior.