What role do labor unions play in resolving disputes? A. They conduct voter education programs.
B. They represent members in negotiations.
C. They tend to favor certain candidates.
D. They conduct research on issues and opinions.

I think it’s D

Tell me if I might

D Tell me if I’m wrong

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.