Final answer:
A head injury patient who opens eyes spontaneously, obeys commands, and is confused should be assigned a GCS score of 12.
Step-by-step explanation:
The Glasgow Coma Scale (GCS) is used to assess the level of consciousness in patients with head injuries. It is based on three parameters: eye-opening, verbal response, and motor response. A GCS score of 15 indicates normal consciousness, while a score of 13-14 indicates a mild brain injury.
In this case, the 20-year-old female opens her eyes spontaneously, is confused, and obeys commands to move her extremities. This suggests a moderate brain injury, so she should be assigned a GCS score of C. 12.