A nurse is preparing to prioritize care for four patients in a busy medical-surgical unit during a shift change. The following information is available:

Patient A: A 75-year-old male with chronic obstructive pulmonary disease (COPD) experiencing increased shortness of breath.

Patient B: A 60-year-old female who is post-operative day 1 following a laparoscopic cholecystectomy, currently reporting moderate pain at the surgical site.

Patient C: A 50-year-old male with diabetes who has an elevated blood glucose level of 320 mg/dL and appears dizzy.

Patient D: A 30-year-old female who is anxious and has been experiencing frequent headaches but is otherwise stable.

In prioritizing care, the nurse needs to complete the following statement: "The patient requiring immediate intervention is __________."