Sally,18 years old,fractured her tibia and fibula in a ski accident.She has just returned to her room following an open reduction of her tibia and fibula.During the next 24 to 48 hours,what is the most effective timing for the nurse to administer Sally's prn analgesic?

A) When Sally requests it
B) On a regular schedule
C) When Sally exhibits signs of pain
D) Four hours after surgery

Administering the analgesic on a regular schedule is the most effective timing as it helps to control pain and prevent it from getting severe. Waiting for Sally to request it or when she exhibits signs of pain may be too late and not provide adequate pain relief. Also, waiting for a set time like four hours after surgery may not be appropriate as the patient's level of pain can vary. Regular scheduling of pain medication ensures constant pain control and allows for faster healing post-surgery.