A nurse is providing care for a group of hospitalized school-aged children. Which of the following clients should the nurse prioritize for further assessment and interventions?

A. While anxiety and withdrawal are concerning, they may not require immediate intervention compared to behaviors that pose risks to the child or others. B. A stable child with a concerned parent may benefit from reassurance and support, but they do not require urgent intervention. C. Stomach pain without an apparent cause should be assessed, but it may not be as urgent as aggressive behavior that can harm others. D. A child exhibiting aggressive behavior poses a risk to themselves and others, necessitating immediate assessment and intervention to ensure safety and manage the behavior effectively.