What is one way to turn this fragment into a complete sentence?

While the choir director was out of the room.Ā 

Ā Ā Ā Ā Ā Ā Ā A.Ā Remove the wordĀ whileĀ Ā Ā B.Ā Take out the prepositional phraseĀ Ā Ā C.Ā Put an exclamation mark at the endĀ Ā Ā D.Ā Add another subject to the sentence