Final answer:
A nursing diagnosis for a client with a psychiatric disorder serves the purpose of providing a framework for selecting appropriate interventions.
Step-by-step explanation:
A nursing diagnosis for a client with a psychiatric disorder serves the purpose of providing a framework for selecting appropriate interventions.
By identifying the specific nursing diagnosis, healthcare professionals can tailor their interventions and treatments to address the patient's individual needs and goals. For example, if a patient is diagnosed with a nursing diagnosis of 'impaired social interaction,' the healthcare team can develop interventions such as group therapy or social skills training to address this specific problem.
Therefore, option C, providing a framework for selecting appropriate interventions, is the correct answer.