The relationship illustrated by the iron triangle is best described by the following response:
Members of Congress create bills that support an interest group in exchange for campaign funding.
The iron triangle typically refers to the stable, mutually beneficial relationship among three entities: congressional committees (or members of Congress), bureaucratic agencies, and interest groups. In this relationship, members of Congress may support legislation that benefits an interest group in return for campaign contributions or support, while interest groups may lobby bureaucratic agencies for favorable regulations.