Question: A psychology study run on a college campus was set up right outside of the gym on a weekday. Chocolate chip cookies were offered right outside the door, and then a sign was placed 15 feet further down the hall that asked people to avoid using the stairs, forcing them to go around in a longer hallway. There were no barriers to using the stairs other than the sign. The results returned, and it showed that individuals who took a sweet from the tray were twice as likely to use the longer hallway as individuals who refused. This is an example of what psychological concept?
A: Learned helplessness
B: Insecure attachment
C: Ego depletion
D: Tyranny of choice
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. Please use JSON format in your answer.
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