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 .
Why is the 6.5 inch gap at the bottom of the door significant ?
Pick the best answer from the following options:
A. None of the above choices .
B. The gap " might " be large enough for her to squeeze through .
C. The gap might be large enough for her to read her book by the light .
D. The gap is large enough to fit her pet bird through .


B