What is a technique for concluding a persuasive speech powerfully?

Concluding a persuasive speech effectively is critical for leaving a lasting impression on the audience. Restating the main message or using a memorable quote serves this purpose exceptionally well. When you recapitulate the core message, it reinforces the key points you've presented, helping the audience to remember and internalize your argument. Including a memorable quote can also resonate emotionally, offering a powerful reflection on your topic and making your speech more impactful.

The other options do not serve the end goal of a persuasive speech. Using complex jargon could alienate the audience, making it harder for them to connect with the material. Repeating the introduction verbatim does not add any new value to your speech and can make it feel repetitive. Ending abruptly without summarizing leaves the audience without closure, which diminishes the effectiveness of the argument presented throughout the speech.