What are examples of interest groups/ name a couple of interest groups

An interest group is any association that attempts to shape public policy and advance their shared interests for a particula problem or cause. Usually interest groups or special interest groups are formally organized and they pressure politicians to apply policies and make changes that favor their interests.

Explanation:

Examples of powerful special interest groups in the United States are the American Civil Liberties Union (ACLU), the National Rifle Association (NRA),  National Association for the Advancement of Colored People (NAACP), and UnidosUS.  These groups have helped to shape policy and act as watchdogs for their interests vis-a-vis the actions taken by politicians in Washington, DC.  

the best answer is b.

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the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.