Answer:
The correct answer is D. With the exception of Nebraska, all states have a bicameral legislative system.
Explanation:
The Nebraska Legislature is the supreme legislature of the US state of Nebraska. It is the only US state that has a single-chamber system and no party affiliation ("nonpartisan"). No other state in the United States has a single chamber of parliament, but two US territories, Virgin Islands and Guam, as well as the Council of the District of Columbia also have single-chamber systems.
