Following an acute myocardial infarction that occurred two weeks ago, an adult male presents for his follow-up appointment, accompanied by his spouse. He tells the nurse that he has lost his appetite, cannot seem to make decisions, and cannot sleep at night. Which intervention is most important for the nurse to implement?

A. Asking the spouse about the client's depression can provide insights but might not be as effective as directly addressing the client. B. While privacy is important, the spouse can often provide additional valuable information. C. Explaining about post-MI depression is informative but does not directly assess the client's current emotional state. D. Encouraging the client to describe his feelings allows the nurse to perform a thorough assessment of the client’s mental state and identify any signs of depression or anxiety.