---I left my handbag on the train, but luckily someone gave it to a railway official.---How unbeliev【单选题】

---I left my handbag on the train, but luckily someone gave it to a railway official.

---How unbelievable to get it back! I mean, someone ______ it.

A. will have stolen

B. might have stolen

C. should have stolen

D. must have stolen