When moving a spine-injured person, commands should be given by the:

The correct choice is the person holding the head. In situations involving a spinal injury, it's crucial to minimize movement of the spine to prevent further injury. The person stabilizing the head has the most critical role in managing the patient's position and ensuring their safety during movement. This individual should be giving commands because they have direct oversight of the patient’s head and neck, which are the most vulnerable areas in spinal injuries.

With the head stabilized, the responder can communicate necessary movements more efficiently, ensuring everyone is coordinated and reducing the risk of exacerbating the injury. The person holding the head can monitor the injured person's condition and provide reassurance, which is vital in high-stress scenarios.

Other options, while they may play important roles in the supportive process, do not have the direct control needed over the positioning and safety of the patient's head, making them less effective as command figures during transport. In an emergency situation, clear communication and coordination are essential, which is why the head holder is designated as the lead for issuing commands for moving the injured individual.