Final answer:
A priority nursing intervention during the termination phase of the nurse-client relationship for an 8-year-old client with ADHD who was admitted for management of temper tantrums would be discussing behaviors that are and are not acceptable on the unit.
Step-by-step explanation:
A priority nursing intervention during the termination phase of the nurse-client relationship for an 8-year-old client with ADHD who was admitted for management of temper tantrums would be option C: Discuss behaviors that are and are not acceptable on the unit. This intervention focuses on setting clear expectations and boundaries for the client's behavior, which can help them understand what is expected of them and reduce the occurrence of tantrums. It also promotes self-regulation and self-control.