The correct option is A backbone
The spinal cord contains many important nerves because of which it's protection is vital. It is protected by the vertebral column, a bony structure consisting of 33 bones. The vertebral column runs along the back which is why it is also known as the backbone. Within this structure lies the meninges and the cerebrospinal fluid, both of which gives the spinal cord further protection. It also helps us to stand erect and maintain posture.