An adult woman with Grave's disease is admitted with severe dehydration and malnutrition. She is currently restless and refusing to eat. Which action is most important for the nurse to implement?

A. Keep room temperature cool: Clients with Graves’ disease are often heat intolerant due to increased metabolic activity. A cool room provides comfort, but it does not address the immediate risk of dehydration and malnutrition. B. Teach the client relaxation techniques: Restlessness and anxiety are common in hyperthyroidism, but teaching relaxation is not the priority when the client is severely dehydrated and refusing food. Stabilization of fluid and nutritional status is more urgent. C. Maintain a patent intravenous site: Severe dehydration and malnutrition require rapid correction with IV fluids and possibly parenteral nutrition if oral intake is not possible. Ensuring IV access is the most critical step to restore hydration, electrolyte balance, and prevent complications. D. Determine the client’s food preferences: Identifying food preferences can encourage better intake, but since the client is refusing to eat and is dehydrated, IV support is immediately necessary before focusing on dietary choices.