Final answer:
The correct option is to immobilize the elbow, forearm, and wrist.
Step-by-step explanation:
When a patient has a suspected fracture to the forearm, it is important to immobilize the area to prevent further injury and promote healing. In this case, the correct option would be D. the elbow, forearm, and wrist. This is because the forearm consists of two bones, the radius and ulna, which are important for the overall stability of the forearm and wrist. Immobilizing only the forearm or wrist may not provide sufficient support to the fractured bone.