The Three Participants in an Iron Triangle Are

The three participants in an iron triangle are

A) a social movement, a political party, and a congressional subcommittee.
B) an interest group, a political party, and a federal agency.
C) an interest group, a social movement, and a federal agency.
D) an interest group, a congressional subcommittee, and a federal agency.
E) a social movement, a political party, and a federal agency.