Final answer:
Minor parties organized around a single issue are characterized by their focus on one specific political matter. They usually lack significant representation in Congress and work to influence public debate and the platforms of major parties.
Step-by-step explanation:
A defining characteristic of minor parties organized around a single issue is B) A focus on one specific political matter. Unlike major parties which have a broad and diverse platform, minor parties typically concentrate on a single political issue or policy area. For example, an ideological party like the Green Party might focus on environmental issues or a Libertarian Party might center around individual freedoms and minimal government intervention.
Minor parties often have little to no representation in Congress, primarily because the two-party system dominates the political landscape in the United States. While they rarely win major elections, these parties can influence public debate, introduce new ideas, and pressure the major parties to address the issues that they advocate for. This is especially true if the issue gains traction among voters or lines up with broader societal trends.