Studies show that crowd activities involve four developmental stages: the occurrence of an exciting event that serves to mobilize people away from their ordinary routines; the physical and psychological milling of people, who became involved in a highly emotional circular type of interaction that serves to disseminate and intensify a common mood; polarization, or the development of a common focus on some unambiguous negative symbol; and the break, or flow of the crowd into overt action toward the symbol. Crowd behavior is ___. .
systematic

nomadic

placid

indistinguishable