Answer: A
The United States Senate is one of two chambers of the United States Congress, the other being the House of Representatives. In the Senate, each US state is equally represented by two members, regardless of their population.
The US House of Representatives can be considered as a "Lower House," the US Senate being the "Upper House," though the US Constitution does not use this language. Each US state has the right to a certain number of representatives in the US House of Representatives. This number varies according to the state population.