Final answer:
For a fractured clavicle, a sling and swathe should be applied to immobilize the area and allow proper healing by limiting movement.
Step-by-step explanation:
To effectively immobilize a fractured clavicle, the best option is to apply a sling and swathe. The sling supports the arm and helps to alleviate the weight of the arm from the clavicle. The swathe is wrapped around the torso and the arm to further immobilize the shoulder and prevent movement of the fractured clavicle. This method helps in the healing process by keeping the bones in a proper position, and it is less restrictive and more comfortable than a rigid splint or other immobilization devices which may not be necessary or appropriate for a clavicle fracture.