Final answer:
The 'voice box' is known as the larynx, an organ in the respiratory system that houses the vocal cords and is involved in producing sound, breathing, and airway protection.
Step-by-step explanation:
The structure also known as the "voice box" is the larynx. This organ is a critical component of the respiratory system, situated between the pharynx and the trachea. The larynx is made up of several pieces of cartilage, including the thyroid cartilage, the epiglottis, and the cricoid cartilage. It also contains the vocal cords, which vibrate to produce sound when air passes over them, allowing for vocalization. Because of this function, the larynx is essential for speech. It also plays an important role in breathing and protecting the airway during swallowing by preventing food and beverages from entering the trachea. When answering the question regarding the 'voice box', the correct choice is c. Larynx.