A rock climber has fallen 20 feet onto a hard surface. He is awake, but confused. He is pale and sweaty, and he is complaining of abdominal pain. He has a deformity of his right arm and several abrasions on his head, face, arms, chest, back, and legs. The best way to position this patient while awaiting EMS is:

A) supine, while providing manual stabilization of the spine.
B) in a sitting position with his knees bent.
C) on his left side with his legs drawn up.
D) on his right side with his legs drawn up.

A