Which of the following statements is an example of ineffective use of volume or rate in public speaking?

Janet is giving a speech about the consequences of drinking and driving. She decides to speak at a more rapid rate to convey a serious tone.

Michael is presenting a speech to $100$ business majors. He has asked to use a microphone so everyone can hear him.

Angela is giving a $90-$minute lecture. She has decided to vary the rate of her speech to emphasize certain parts of her message.

Jim was using a lavalier microphone to make his speech, so he made sure that it was placed where it would not be moved or bumped.