Bechky's Study of Film-Production Crews Suggests That Roles

Bechky's study of film-production crews suggests that roles

A) are developed by those in positions of leadership,who build them into the structure of the organization.
B) once developed,become stable and resistant to change.
C) usually fit one kind of person,who stays with that role once he or she occupies it.
D) are negotiated and modified as group members interact with one another.
E) generate conflict in groups as members compete for more prestigious roles.