Answer: starting to talk over the audience to quiet the down.
All of the other strategies are recommended whenever you are delivering a speech, except for this one. It is important to check that all of your equipment is working. Moreover, you should make sure you are using appropriate language and that you are looking at your audience. However, you should not try to talk over them. Not only can this appear rude and unprofessional, but it can cause the audience to miss important information.