Which of the following is NOT commonly considered one of the main parts of a speech?

The correct answer indicates that "main ideas" is not commonly regarded as one of the primary components of a speech. In the structure of a typical speech, the introduction, body, and conclusion are universally acknowledged as essential elements.

The introduction serves to grab the audience's attention and provide a clear thesis statement, setting the stage for what is to follow. The body contains the core content, including the main points and supporting details that elaborate on the thesis. The conclusion then wraps up the speech, reinforcing the main points and leaving the audience with a final thought or call to action.

While main ideas are certainly integral to crafting the content of a speech—serving as the key messages that the speaker wants to convey—they are typically embedded within the body of the speech, rather than being classified as a separate main part. Hence, "main ideas" does not fit into the established structure of a speech in the same way the introduction, body, and conclusion do.