Final answer:
The nurse should encourage deep breathing exercises to prevent respiratory complications in an immobile stroke patient, as these exercises aid in gas and nutrient exchange and prevent fluid diffusion into interstitial spaces.
Step-by-step explanation:
The correct intervention for a nurse caring for a client who is immobile from a recent stroke is option B) Encourage deep breathing exercises. This intervention is crucial to prevent respiratory complications, such as pneumonia, which can occur due to immobility. Implementing deep breathing exercises assists with gas and nutrient exchange and helps prevent the diffusion of fluid into the interstitial space, thereby maintaining lung function and preventing atelectasis. On the contrary, limiting fluid intake would not help prevent complications in a stroke patient, and avoiding turning and repositioning could actually contribute to the development of pressure ulcers. Administering pain medication may be necessary for comfort but does not directly address prevention of complications due to immobility.