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.

True hope this and hope it was what you were asking for