An​ 89-year-old female nursing home patient was witnessed to have a​ tonic-clonic seizure. The seizure has now stopped. You find her now with altered mental status. Staff members note that she has been treated for an upper respiratory infection for the last week but has been getting sicker. You note that the patient is lethargic and febrile. She is breathing rapidly but has no radial pulse. Her carotid pulse is 130. You should​ suspect:

A. Hypoglycemia.
B. Sepsis.
C. Acute myocardial infarction.
D. Diabetic ketoacidosis.