Why do agencies resist deregulation?

Question $23$Select one:

a$.$

Once a regulation is set into law, it is very difficult to deregulate it without amending the Constitution.

b$.$

Interest groups put pressure on bureaucracies for more regulation.

c$.$

Agencies exist because of regulation, and without regulation, the agency $($and the jobs it creates$)$ would disappear.

d$.$

All of the above