Which one of the structures below is different from the other three? 
Definitions:
Bystander Effect
The social psychological phenomenon that individuals are less likely to offer help to a victim when other people are present, often due to the diffusion of responsibility.
Attribution of Arousal Theory
A psychological principle suggesting that people make sense of their emotional or physiological states by attributing them to environmental or situational cues.
Romantic Love
An emotional state characterized by idealization of the beloved, obsessive thoughts of this person, and turbulent feelings.
Halo Effect
The tendency to assume that people who have one good trait also have other good traits.
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