Final answer:
Issuing an appeal at the end of a speech is an example of rhetoric, which is the art of persuasion using language to influence an audience.
Step-by-step explanation:
Issuing an appeal or a challenge at the end of a speech is an example of rhetoric. The term rhetoric refers to the art of persuasion, where a speaker or writer communicates in a way that is intended to influence an audience's perspective. It dates back to ancient Greece and includes the use of various appeals such as ethos, logos, pathos, and kairos. An appeal at the end of a speech often involves pathos to evoke emotions or logos to reinforce logical arguments to galvanize an audience into action. This rhetorical strategy is integral to effective oratory and is crafted considering the audience and timing (kairos) for maximum impact.