15 minutes later she resigned to the fact that she could be in there all day long so she started looking around . That 's when she noticed the 6.5-inch gap above and below the otherwise impenetrable door , and a bulb went off inside her dome .

Question: What may be the reason she could be there all day ?
Answer: None of the above choices .There was hardly anyone in the building .There was a long waiting list to get in .There was no one working there at the time .