Final answer:
The nurse uses the therapeutic technique of focusing by steering the client's conversation towards his employment situation, which is a specific stressor affecting his well-being.
Step-by-step explanation:
The nurse is using the therapeutic technique known as focusing. This technique involves directing the client's attention to a single point of concern or issue, in this case, the client's employment situation.
By suggesting that the client talks about their employment situation in group therapy, the nurse aims to concentrate the discussion on this particular stressor, which could be contributing to the client's sleeplessness and marital upset. Focusing can help the client elaborate on specific problems, leading to greater insight and problem-solving strategies.