Read the following context and choose the best option to answer the question.
Context: Yesterday was no exception . When I arrived inside the airport in front of the United ticket counter area , the first thing I noticed was that the Premier Executive line was closed off . Normally there are United employees out front directing passengers . This time there were none .
Question: What may have happened when the United employees directing passengers   were absent
Options: 
A. None of the above choices .
B. There was a robbery attack
C. The queue were with no orders
D. The plane seized to move


C