What are considered "supporting materials" in a speech?

Supporting materials in a speech are essential components that help reinforce and validate the main points being presented. This choice highlights the importance of using specific evidence, examples, statistics, anecdotes, and data that bolster the speaker's arguments and enhance audience understanding. By providing clear and relevant supporting materials, a speaker can establish credibility, make their message more persuasive, and ensure that the audience can follow and relate to the information being shared.

Using evidence or examples allows the speaker to illustrate their main ideas vividly, making the speech more engaging and relatable. This technique often helps in clarifying complex concepts or positions, strengthening the speaker's overall argument.

The other options focus on specific types of materials, such as visual aids, which are helpful but do not encompass the broader category of supporting materials that includes various forms of evidence and examples. Background information, while useful in providing context, does not directly function as support for the main arguments but rather sets the stage for understanding the topic at hand.