Jonathan Tripped on a Sprinkler During a Game of Flag

Jonathan tripped on a sprinkler during a game of flag football,and felt a sharp pain as he broke his ankle.Later on,after he returned home from the emergency room with a new cast,he felt a dull,aching pain in his broken ankle.Which of the following is the best explanation for Jonathan's experience?​ 

A) The sharp pain resulted from the transmission of messages along C fibers, and as the rate of signaling dropped, the quality of the pain changed to dull and aching. 
B) The sharp pain resulted from the activation of nociceptors that respond to mechanical injury, whereas the dull pain resulted from the activation of nociceptors that respond to chemicals released by damaged cells. 
C) The sharp pain resulted from the transmission of messages along C fibers, and the dull pain resulted from the transmission of messages along Ad fibers. 
D) The sharp pain resulted from the transmission of messages along Ad fibers, and the dull pain resulted from the transmission of messages along C fibers.