Its c right?
1. if you are involved in a collision, what should you do?
a. identify yourself and leave
b. call an ambulance and then leave
c. the injured, identify yourself, and call the police

C. Help the injured, identify yourself, and call the police. Hard to believe this wasn't answered sooner. 

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.