Final answer:
The most appropriate immediate care for a midshaft tibiofibular fracture is to activate EMS, splint the injury in correct alignment, elevate the distal extremity, and monitor for shock.
Step-by-step explanation:
The most appropriate immediate care for a midshaft tibiofibular fracture, such as the one sustained by the forward in the soccer game, is option a.) activate EMS, splint the injury in correct alignment, elevate the distal extremity and monitor for shock. This option ensures that medical professionals are summoned to the scene, the injury is immobilized in the correct alignment, the affected extremity is elevated to reduce swelling, and the patient's condition is monitored for signs of shock.