Final answer:
College students would be least likely to maintain a national lobbying organization in Washington D.C., compared to environmental activists, labor unions, and business corporations.
Step-by-step explanation:
The group that would be LEAST likely to maintain a national lobbying organization in Washington D.C. would be college students. College students are less likely to have the financial resources and organizational infrastructure needed to establish and maintain a lobbying organization at the national level. In contrast, environmental activists, labor unions, and business corporations have a strong interest in influencing policy and have the resources to establish and sustain lobbying organizations to represent their interests.