All of the following are examples of warm-up exercises for your body and voice except: a. drink lots of water. avoid too much caffeine, alcohol, or other dehydrating liquids the day of your presentation. b. pretend like you're chewing a giant wad of bubble gum stretch your jaw, lips, tongue. add a vocal sound any old sound don't make it pretty. c. raise your arms up overhead while you inhale through your nose, keeping your belly free. d. all of the above are examples of warm-up exercises for your body and voice.

D. All of the above are examples of warm-up exercises for your body and voice. 

Drinking a lot of water will help keep your body and throat hydrated so that you do not strain the muscles. Caffeine and alcohol will do the opposite, so you want to make sure to avoid them.

Moving your mouth will help loosen and warm up those muscles so that your enunciation is more precise, and making noises will also help warm up your vocal chords.

Stretching your arms above your head will stretch your muscles, and practicing breathing through your nose engages your diaphragm and proper breathing techniques.