After years of struggling with weight management, a middle-aged adult client is evaluated for gastroplasty. The client has experienced difficulty with managing diabetes mellitus and hypertension, but is approved for surgery. Which intervention is most important for the nurse to include in this client's plan of care?

A. Monitoring for urinary incontinence may be important but is not the priority in the context of weight management and post-surgical care for gastroplasty. B. Clients undergoing bariatric surgery are at increased risk for depression due to changes in body image and lifestyle. Observing for signs of depression is crucial to support the client’s mental health and ensure adherence to the postoperative plan. C. While providing a wide variety of meal choices can be helpful, it is more important to ensure that the client’s psychological needs are addressed first. D. Applying sequential compression stockings is important for preventing venous thromboembolism but is not the most critical intervention related to the client's specific context of weight management and mental health.