When you get right down to it, social roles in a group are:

A) behavioural prescriptions.
B) actually the people.
C) intrinsically superficial in nature.
D) facilitate flow of information.

Behavioral Prescriptions

Specific guidelines or recommendations for how individuals should behave in particular situations or contexts.

Information Flow

The movement or transfer of information from one place, person, or group to another, within any system that processes data.