The  concept that  is represented by the possibility that no one wants to pay someone else to wait in line is: A. Operating risk.
Operating risk can be defined as those risk that a company encounter during the course of the day to day business operation.
This scenario illustrate operating risk based on the fact people does not want to risk their money by paying someone else to stand on the queue for them in which at the end of the day the person may disappoint them by failing to carryout the tasks he was paid for.
Therefore the correct option  is A
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