Which of the following is a professional association interest group?

The American Medical Association (AMA) is a prime example of a professional association interest group because it is specifically organized to represent the interests of physicians and medical professionals. As a professional association, the AMA works to advocate for policies, standards, and practices that benefit its members, promoting quality health care and medical education. This aligns with the key characteristics of a professional association, which focuses on enhancing the professional environment and interests of its members.

In contrast, organizations like Common Cause, the National League of Cities, and the National Rifle Association focus on broader advocacy efforts or represent specific policy or community interests rather than strictly professional ones. Common Cause deals with campaign finance reform and government transparency, while the National League of Cities represents municipal governments and advocates for urban policy issues. The National Rifle Association, primarily focused on gun rights and related legislation, supports the interests of firearm owners and enthusiasts. Each of these groups serves different purposes and constituencies, which distinguishes them from professional associations like the AMA, aimed specifically at representing professional interests.