Which of the following sentences contains a dangling participial phrase?

A、PedritogotintoserioustroublemissingthegrammarquizlastMonday.
B、Tocompletethegrammarquizontime,youwillhavetoclickyourheelsthreetimes.
C、Whentakingagrammarquiz,concentrationiseverything.
D、Noneoftheabove.