Jeff, Greg, Dan, and Ray All Watched as the Building

Multiple Choice

Jeff, Greg, Dan, and Ray all watched as the building across the street burned to the ground. They kept waiting for the fire trucks to show up, even though none of them had called 911. In this case, the fact that none of the four friends phoned to report the fire illustrates the phenomenon known as ​

A) social loafing.
B) a self-fulfilling prophecy.
C) group polarization.
D) the bystander effect.