No one else in the room , I walked towards the door to get out but found it locked . I walked behind the bar but there was no liquor - strange , as Darius always kept the place well - stocked . I grabbed a glass and filled it with cola from the soda gun and sat down at the bar .

Question: What 's a possible reason the writer filled a glass with cola ?
Answer: The door was locked .Darius kept the place well stocked .No one else was in the room .None of the above choices .