Which of the following can be included in a speech's supporting material?

Supporting material in a speech is essential for reinforcing the main points and making the content more engaging and credible for the audience. The correct choice includes a variety of elements designed to support the speaker’s message effectively.

Statistics provide concrete data that can validate claims and illustrate the significance of an argument. Anecdotes bring a personal touch and help to connect with the audience on an emotional level, making the content relatable. Expert testimony adds authority to the speech by citing individuals with established credibility in a particular field, helping to persuade the audience. Examples serve to clarify complex ideas and provide tangible illustrations of abstract concepts.

When combined, these elements create a well-rounded and persuasive presentation, making the information presented more convincing and easier for the audience to understand. Other options either limit the scope of supporting material significantly, focusing on a single type of content or method, which would restrict the effectiveness of the speech. By using a diverse array of supporting material, speakers can enhance their arguments and engage their listeners more fully.