When using the webbing drag, the victim's head is supported by:

In the webbing drag technique, the victim's head is supported primarily by their own arms. This method is designed to ensure that the weight of the head is effectively balanced and that the victim is moved in a manner that minimizes further injury during a rescue. By using the victim's arms in this position, it helps to stabilize the head and neck, which is crucial in situations where spinal injuries may be suspected.

Supporting the head using the victim's arms allows for a more controlled drag, reducing the risk of head or neck movement that could exacerbate any existing injuries. This technique is especially important in a scenario where the rescuer must act quickly while ensuring the victim’s safety.

Other methods, such as using webbing under the head or a roll of blanket, may not provide the same level of stability and could potentially lead to additional movement of the head and neck. Thus, the answer provided accurately reflects the proper technique for safely executing a webbing drag in a rescue scenario.