We left for a summer camp at $4:30$ PM and got to our destination at $6:40$ PM. How long did we travel?~ 
选项为:A:$1$ hour $40$ minutes  B:$2$ hours $10$ minutes  C:$2$ hours $20$ minutes  D:$1$ hour $50$ minutes  E:$50$ minutes  请回答其中一个选项.