The correct answer is option 1 - Larynx. The larynx is commonly known as the voice box and is responsible for producing sound in humans. It is located in the throat and consists of vocal cords, which vibrate when air passes through them, producing sound. The larynx plays a crucial role in speech and is responsible for controlling the pitch, volume, and quality of our voice.

Option 2 - Tongue, although important for articulating and shaping sounds, does not produce sound on its own.

Option 3 - Lungs play a role in the production of sound as they provide the air required for vocalization, but they do not directly produce sound.

Option 4 - Diaphragm is responsible for regulating the flow of air during exhalation, creating a steady stream of air for vocalization, but it does not produce sound.