Final answer:
The nurse should include encouraging the client to explore their unconscious thoughts and feelings as an intervention in the plan of care based on the psychoanalytical model.
Step-by-step explanation:
The nurse should include encouraging the client to explore their unconscious thoughts and feelings as an intervention in the plan of care based on the psychoanalytical model. This aligns with the principles of psychoanalysis, which emphasize understanding the unconscious mind and how it influences conscious behavior. By encouraging the client to explore their unconscious, the nurse can help them gain insight into their thoughts, feelings, and experiences that may be contributing to their current difficulties.