A nurse is caring for a client who experiences severe anxiety when going to work. The nurse should identify that which of the following areas of the autonomic nervous system is stimulated when the client goes to work?

A. The sympathetic nervous system is responsible for the "fight or flight" response, which is triggered during times of anxiety, stress, or fear. It increases heart rate, blood pressure, and prepares the body to respond to perceived threats, which aligns with the client's severe anxiety going to work. B. The limbic system plays a role in emotion and memory but is not directly responsible for the physiological changes associated with anxiety. C. The parasympathetic nervous system is responsible for "rest and digest" functions, counteracting the sympathetic nervous system’s responses during relaxation, not during anxiety. D. The vagus nerve is part of the parasympathetic system and is not primarily responsible for the acute anxiety response.