A 23-year-old female patient presents to the emergency room (ER) with a feeling of being unable to catch her breath, light-headedness, and "tingling" of her fingers, toes, and around her mouth. This happens whenever she drives through a tunnel and that is what set off this episode. Which of the following arterial blood pH would be most consistent with her diagnosis?
8.1 7.55 7.15 6.4