A 53-year-old male patient has cut his leg with a chain saw. His airway is patent, he is breathing 18 times per minute with good tidal volume, and supplemental oxygen has been applied. Bleeding has been controlled with a tourniquet, and the patient is pale, diaphoretic, and anxious. You should:

A) gather a detailed medical history.
B) perform a reassessment.
C) question bystanders.
D) treat the patient for shock.

D