The correct answer is B. The US Chamber of Commerce is an example of an economic interest group.
Explanation:
The United States Chamber of Commerce is the largest non-profit lobbying organization in the world, representing the interests of broad business circles and associations of the USA, and the leading lobbyist on annual expenses for these activities. Formed on April 12, 1912, the headquarters is located in Washington DC. After almost a century, it has over 300,000 members, 3,000 regional and state chambers affiliated with the US Chamber of Commerce, and over 90 American chambers of commerce abroad. According to the chamber, 96% of its members are small businesses.
