Your patient is a 24-year-old man who smoked a cigarette dipped in formaldehyde and then went outside with no shoes on and walked in the snow for about an hour. He has deep local cold injuries to both feet. Which of the following should be included in your management of this patient?

A) Massage the feet briskly.
B) Have the patient sit with his feet lower than the rest of his body.
C) Break blisters before wrapping both feet in sterile dressings.
D) Gradually rewarm both feet.

D