Which element relies on logic, credibility, and emotion?
rhetorical devices
theme statements
purpose statements

The correct answer is rhetorical devices.

Rhetorical devices, such as pathos, logos, and ethos, are elements that rely on logic, credibility, and emotion. Pathos is all about emotions - trying to elicit certain feelings in your audience. Logos is all about logic - using logic to make an argument. Ethos is all about credibility - using reliable sources and facts in order to persuade your audience to believe you.