I believe the best option for you to pick will be option C)
All of them could be intentional/unpreventable, we are only talking about an injury so I would say the plane crash.
C) Animal vector; Lyme disease ( it's spread by animals or bugs )
B) Direct contact; Staphylococcus ( could get it from touching someone that has it )
A) Sexual contact; Human papilloma virus
Good luck! (: