Which of the following is the primary purpose of interest groups?
a.
advancing a particular cause or belief
b.
raising money for a particular cause
c.
donating money to political candidates who share a common belief
d.
encouraging investment in a particular industry or economic sector

A.  Advancing a particular cause or belief

Interest groups are a type of formal organization of people, whose primary purpose is to advance a particular cause, policy or belief that benefits them directly or one segment of society or several.

They attempt to do so by taking several actions that include to lobby government (including members of Congress, the executive branch, etc.), engage in election activities, educate people about their interests, activities, relevance, current issues, etc., and to mobilize people who act on behalf of the organization in order to perform activities, such as writing letters, making phone calls and demonstrating, among others.

the answer is )multiethnic

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.