Which of these techniques is mentioned in the chapter as a way to hold an audience’s attention…

Which of these techniques is mentioned in the chapter as a way to hold an audience’s attention…

Which of these techniques is mentioned in the chapter as a way to hold an audience’s attention during a presentation?
a. Speak louder than average
b. Tell people that management expects them to pay attention
 c. Use clear and vivid language
 d. None of the above