A nurse is caring for a group of adolescents. Which of the following findings should be reported to the provider immediately?

A. A burn injury with a pain response is concerning but not immediately life-threatening compared to the other options. B. A significant drop in blood pressure upon standing (orthostatic hypotension) can indicate dehydration, blood loss, or other serious conditions that need immediate attention. C. An increase in pain after ambulation with an ankle fracture is expected and should be managed but is not an immediate threat to the client's overall health. D. A postoperative temperature of 37.5° C (99.5° F) is within the expected range and not indicative of an immediate complication.