The correct answer is option 'D': Larynx.

The voice box, also known as the larynx, is a part of the respiratory system located in the throat region. It plays a crucial role in producing sound and enabling us to speak. Let's explore the functions and structure of the larynx in more detail.

Function of the Larynx:
The primary function of the larynx is to produce sound, which is essential for speech. It acts as a passageway for air to move in and out of the respiratory system while also preventing food and liquids from entering the airway. Additionally, the larynx helps in protecting the lower respiratory tract from any foreign particles or substances.

Structure of the Larynx:
The larynx is composed of various structures, including muscles, cartilages, ligaments, and vocal cords. Here are the key components of the larynx:

1. Cartilages: The larynx comprises several cartilages that provide structural support and protection. The largest of these cartilages is the thyroid cartilage, commonly known as the Adam's apple. Other cartilages include the cricoid cartilage, arytenoid cartilages, and the epiglottis.

2. Epiglottis: While the voice box itself is located in the larynx, the epiglottis is a flap-like structure attached to the larynx. It prevents food and liquids from entering the windpipe during swallowing by closing over the opening of the larynx.

3. Vocal Cords: Within the larynx, there are vocal cords or vocal folds. These are two bands of elastic tissues stretched across the larynx. The vocal cords are responsible for producing sound when air passes through them, and their tension and position can be adjusted by muscles to control pitch and volume.

4. Muscles and Ligaments: The larynx also contains muscles and ligaments that aid in its function. These muscles help to control the position and tension of the vocal cords, allowing for variations in pitch and tone during speech.

Conclusion:
In conclusion, the voice box, also known as the larynx, is responsible for producing sound and enabling speech. It is located in the throat region and consists of various structures, including cartilages, vocal cords, muscles, and ligaments. The larynx plays a vital role in respiration, vocalization, and protecting the lower respiratory tract. Therefore, the correct answer to the question is option 'D': Larynx.

Voice box is responsible for producing sound in human beings. It is present in larynx