What is the value of summarizing key points during a conclusion?

Summarizing key points during a conclusion serves to reinforce the main message of the speech or presentation. By revisiting the essential arguments or themes, the speaker helps to solidify the audience's understanding and retention of the material presented. This technique not only provides clarity but also emphasizes the importance of the main ideas, ensuring that the audience leaves with a clear and memorable takeaway. In contrast to the other options, introducing new ideas or extending the speech length can detract from the focus and effectiveness of the conclusion. Keeping the audience guessing may create uncertainty rather than ensuring comprehension and closure. Thus, reinforcing the main message is fundamental to effective communication.