Multi-choice problem: Continue writing the next sentence in this paragraph:

How to stop a yawn
Breathe through your nose and exhale through your mouth.
Some scientists theorize people yawn because of a lack of oxygen. Therefore, taking a few deep breaths when you feel a yawn coming on can help stop it before it starts.

Available choices: i. Know when it's time to sleep. In general, people yawn when they're tired because by causing the muscles to contract, the body produces more energy. ii. Open your mouth wide and suck in air from the back of your throat. Hold your lips like you are trying to yawn, then pull them back toward your mouth, exhaling gently through your mouth. iii. Take several breaths, either before or during a yawn. Hold the nose closed for a short period of time, then take another breath and hold it. iv. You should breathe through your nose and out through your mouth. This allows the most oxygen to enter and channels the air into your diaphragm.
iv.