MrHughes Heard What Sounded Like Cries for Help from a Swimmer

Multiple Choice

Mr.Hughes heard what sounded like cries for help from a swimmer located 30 yards from the ocean shoreline.He continued walking along the beach,however,because he figured that one of the many swimmers in the vicinity would provide help if it was needed.His reaction best illustrates the dynamics involved in

A) social exchange theory.
B) the reciprocity norm.
C) the bystander effect.
D) the mere exposure effect.