I think that mob action is like a disease that overtakes healthy people,corrupts them,and causes them to act in ways they never would normally.I favor ___ theory of crowding.

A) convergence
B) emergent norm
C) Le Bon's contagion
D) social identity

After surviving an Amtrak derailment, John experienced frequent, vivid thoughts and images of the accident for several months. He also had problems sleeping and was irritable and withdrawn. John is suffering from:

A) major depression.
B) posttraumatic stress disorder.
C) generalized anxiety disorder.
D) panic disorder.