A 48-year-old female with no known medical history presents for periodic "attacks" of headaches, sweating, and palpitations over the past 4 months. These Ch episodes are associated with nausea and chest pain and do not seem to be related to exercise or exertion. Each episode lasts for 1-5 minutes and resolves Qu without intervention. Her vital signs, physical examination, and electrocardiogram are normal. Which of the following is the most appropriate test to establish the correct diagnosis?
A. Cardiac catheterization
B. Plasma catecholamine
C. CT scan of the adrenal glands
D. 24-hour urine catecholamine