Final answer:
The nurse's best response would be option D: 'I'm not quite sure I heard what you were saying about your work.' This response acknowledges the client's upset and expresses the nurse's willingness to understand the issue.
Step-by-step explanation:
The nurse's best response in this situation would be option D: I'm not quite sure I heard what you were saying about your work. This response acknowledges the client's upset and expresses the nurse's willingness to understand the issue. By admitting uncertainty, the nurse avoids making assumptions or invalidating the client's feelings.