A doctor reports a single occurrence of a disease to the Centers for Disease Control as a disease outbreak. Which of these factors most likely led to the doctor's actions? A. The disease causes a variety of symptoms, including fever and nausea. B. The disease has been absent from the population for a long time. C. The disease is typically more common in children than it is in adults. D. The disease causes symptoms that can last from 7 to 14 days.