On a Crowded Sidewalk a Man Falls Down, Dropping Most

Multiple Choice

On a crowded sidewalk a man falls down, dropping most of what he is carrying. It is unclear if he has fallen ill or is hurt. Nola seeks the man fall, but noticing that others around him seem to not be concerned, she decides he may have just tripped and it's not really a situation requiring assistance. Nola has just experienced the

A) social loafing.
B) group polarization.
C) the bystander effect.
D) obedience to authority.