Cordelia, an active duty marine, served in Afghanistan. While she was on patrol with her friend, an IED went off, killing her friend and injuring Cordelia's left arm. In the two months since the incident, Cordelia has been experiencing pain and limited mobility in her left arm. Which of the following options is the most likely cause of Cordelia's symptoms?
1) Nerve damage
2) Muscle strain
3) Bone fracture
4) Infection