An Awake but Confused Patient with a Diabetic History Spilled

An awake but confused patient with a diabetic history spilled a pot of hot water on himself while cooking. He has a partial-thickness burn on his right anterior leg. Following an unremarkable primary assessment, which action is your highest priority?

A) Determine the percentage of body surface area burned.
B) Check the patient's blood glucose level.
C) Assess for signs of infection at the burn site.
D) Apply sterile dressings to the burn.