Answer :
Answer:
B. Be more redundant by repeating key points
Explanation:
After Mariah notices that her audience does not understand the point she is making, she should repeat key points. Key points of a spoken or written text are its most important points. If we don't understand them, understanding the rest of the text is impossible. She should try additionally explaining them, or even use a different approach when doing so if she notices that the previous one is not working.
Speeding up the pace of delivery would additionally confuse the audience. Telling a story and using humor would only serve as a distraction, which is not something we want to do when we want to convey important information. It is important for the audience to understand the purpose of Mariah's speech, so the correct option is B.