Final answer:
The party leadership in Congress controls the actions of Congress by being elected by the two-party conferences in each chamber and discussing important issues and strategies for policy advancement.
Step-by-step explanation:
The true statement regarding the leadership structure of Congress, based on the provided information, is that the party leadership in Congress controls the actions of Congress.
The party leaders are elected by the two-party conferences in each chamber, such as the House Democratic Conference and the House Republican Conference. They not only elect the leaders but also discuss important issues and strategies for policy advancement. The conference with the majority of members becomes the majority conference, while the other becomes the minority.
Independents, like Senator Bernie Sanders, typically join one of the major party conferences in order to have a better chance of influencing decision-making and getting things done in Congress.