Final answer:
The next priority for the unconscious 20-year-old female with a history of type 1 diabetes and an eating disorder is the administration of insulin.
Step-by-step explanation:
The next priority for the unconscious 20-year-old female with a history of type 1 diabetes and an eating disorder is the administration of 0.1 unit of regular insulin IV push followed by an insulin infusion (option 2). In this case, the lab values indicate diabetic ketoacidosis (DKA) which is a life-threatening condition. The high glucose level, low pH, low HCO₃-, and high anion gap suggest that the patient is in DKA. Insulin administration is crucial to correct the underlying problem of relative insulin deficiency and hyperglycemia in DKA.