The major organ of the nervous system encased in the skull is the brain (option C).
Explanation:
1. The brain is the most significant organ of the nervous system and is protected by the skull, which acts as a hard covering to safeguard this vital organ.
2. It serves as the control center for the body, processing information received from the sensory organs, coordinating body functions, and enabling us to think, learn, and experience emotions.
3. The brain is composed of different regions, each responsible for specific functions such as motor skills, memory, language, and sensory processing.
4. Damage to the brain can have profound effects on a person's ability to perform daily tasks and can impact various aspects of their life.
In summary, the brain is crucial for human function and plays a central role in controlling and regulating the body's activities.