Collective Behaviour Is

Collective behaviour is:

A) large scale behaviour that is institutionalized
B) behaviour on a large scale that is governed by appropriate social norms
C) behaviour by a collection of people which is spontaneous, unorganized and lacking strong leadership, and which is the product of interstimulation among the participants
D) behaviour induced by the mere presence of others
E) any action carried out by a person or persons as a result of pressure from other people or groups