Leaders of Some of the Largest Interest Groups, Such as the NRA

Leaders of some of the largest interest groups, such as the NRA or AARP,  are said to form "an elite within an elite" for which of the following reasons?

A) They live in or near Washington, D.C.
B) They work in or near Washington, D.C.
C) They are highly paid, putting them in an upper-income bracket.
D) They have access to members of Congress and their staffs on a regular basis.
E) All of these are correct.