The school nurse is interviewing a 13-year-old girl who wants to go home from school because of "back pain." Which question should the nurse ask the adolescent first?

A. Understanding the onset and activities related to the back pain can help the nurse determine if it is musculoskeletal, posture-related, or indicative of a more serious underlying issue. B. Asking about medication is secondary until more information is gathered about the pain's onset and nature. C. Changing positions may be relevant later, but initially, it is important to identify any possible triggers for the pain. D. Asking about previous pain episodes may be helpful, but understanding the current episode’s cause is more pressing.