A 67-year-old female complains of severe left lower leg pain. She states that she was walking across the room when she suddenly heard a "crack" and felt excruciating pain in her leg. Her left tibia appears to be deformed and ecchymotic, as well as tender on palpation. Her vital signs are pulse 96 beats/min, respirations 28 breaths/min, blood pressure 168/74 mmHg, and SpO2 98%. Additionally, the patient states that her doctor told her that the steroids she takes can weaken her bones, placing her at greater risk for fractures. Appropriate care for this patient would include:

A) High-concentration oxygen by mask
B) Full immobilization to the long board
C) Direct pressure to the area of injury
D) Application of a splint to the leg

D) Application of a splint to the leg