Final answer:
The nurse would ask about the patient's emotional state and feelings of connectedness, such as whether they are feeling isolated or upset, to determine their belonging needs.
Step-by-step explanation:
When a nurse is observing a client to determine belonging needs, which relate to a patient's psychological needs for social relationships and a sense of community, the nurse would ask questions that inquire about the patient's emotional state and feelings of connectedness. The option "D. Are you feeling isolated or upset?" directly addresses the client's belonging needs by discussing their emotional state and potential feelings of isolation. The other options, while they might be relevant to the patient's overall health, do not pertain specifically to assessing belonging needs.