Final answer:
To treat an open femur fracture, the tourniquet should be removed and bleeding controlled using less aggressive methods. Immobilization of the leg is necessary, and the victim should be transported to the emergency department.
Step-by-step explanation:
For the treatment of an open femur fracture, the correct option would be C: Immediately remove the tourniquet and control bleeding with less aggressive methods, immobilize, and transport. The tourniquet, although effective in stopping the bleeding temporarily, can cause damage to the tissues and should be removed as soon as possible. To control the bleeding, direct pressure should be applied to the wound using sterile dressings or cloths. Immobilization of the extremity is important to prevent further injury and should be done using splints or other immobilization techniques. Following these steps, the victim should be transported to the emergency department for further treatment.