I, too, thought SOB after reading through the choices. The pt could have a life threatening PE, plus airway is #1 focus over chest pain.
I would say SOB, chest pain, Pain, family member wanting update. If you feel the rest of the interview went well, I wouldn't focus too much on this one question. If they wanted you to pass a "test" question, they wouldn't bother with a whole interview--you are a whole person, with other insights and things to offer, its the whole package
I would trust your overall confidence and get a good night's sleep. Best wishes you get what you wish for!