A parent describes a 3-year-old child in constant motion and is unable to sit still during story time. The parent is concerned about this behavior. Which nursing response indicates an appropriate evaluation of the situation?

"This child has symptoms of the early stages of autistic disorder."

"This child's behavior indicates possible symptoms of oppositional defiant disorder."

"This child has symptoms of attention deficit hyperactivity disorder."

"This child's behavior must be evaluated according to developmental norms."