Read the following context and choose the best option to answer the question.
Context: 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 ?
Options: 
A. None of the above choices .
B. There was hardly anyone in the building .
C. There was a long waiting list to get in .
D. There was no one working there at the time .


C