A nurse is caring for a young adult client who has somatic symptom disorder and is being evaluated for chest pain. The client's laboratory results are all within the expected reference ranges, the ECG is unremarkable, and the client has no identified cardiac risk factors. Which of the following actions should the nurse take?

A. Inform the client that the pain is not real. Clients with somatic symptom disorder experience genuine distress, even if their symptoms lack a medical explanation. Dismissing their pain as "not real" can damage trust and discourage them from seeking appropriate care. B. Provide reassurance to the client. Reassurance helps reduce anxiety and reinforces that the symptoms are not life-threatening. The nurse should validate the client’s feelings while gently redirecting their focus to coping strategies and stress management techniques. C. Encourage the client to request invasive cardiac testing. Since the client has no cardiac risk factors and all test results are normal, unnecessary invasive procedures are not warranted. Encouraging further testing could reinforce the client’s health anxieties rather than helping manage their symptoms. D. Refer the client for flooding therapy. Flooding therapy is an exposure-based treatment used for phobias and post-traumatic stress disorder (PTSD). It is not an appropriate intervention for somatic symptom disorder, which requires cognitive-behavioral therapy (CBT) and supportive reassurance.