I need help with this question, thank you!

When delivering a speech, what should the speaker be sure to do?

A. Vary his or her rhythm and use pauses to let the audience follow along.

B. Use a soft tone of voice and a gentle demeanor to force the audience to listen closely.

C. Begin and end with a joke to win over the affection of the audience.

D.Maintain a loud, forceful tone throughout the speech to maintain audience interest.