The Nurse Has Been Aggressively Treating a 23 Year Old

The nurse has been aggressively treating a 23 year old female who was admitted for Diabetic Ketoacidosis 7 hours ago. The nurse has been closely monitoring an insulin drip and monitoring blood glucose levels every hour. When is it appropriate to begin administration of subcutaneous insulin?

A) When the blood glucose level is between 50 and 100 mg/dL.
B) When the blood glucose level is between 100 - 200 mg/dL.
C) When the blood glucose level is between 150- 250 mg/dL.
D) When the blood glucose reaches 80 mg/dL.