Final answer:
Low pitch voice production involves loose vocal folds and low air pressure, aligning with the biological principles of how sound is generated in the human vocal apparatus. The correct option is b).
Step-by-step explanation:
Low pitch in human voice is produced when the vocal folds are loose and there is low air pressure. Therefore, the correct answer is b) Loose; Low.
When speaking or singing at a low pitch, the muscles of the larynx are more relaxed, which lessens the tension on the vocal cords, making them vibrate more slowly. Conversely, a high pitch is created by tighter vocal folds under higher tension, vibrating at a faster rate.
Gas naturally moves from an area of high pressure to an area of low pressure, according to basic principles of physics and physiology. This movement of air is essential in voice production, as it enables the vocal cords to open and close rhythmically, creating the sound waves that emerge from the mouth as voice. Option b) is the correct one.