Which statement best explains why the framers of the constitution created a bicameral legislature for the u. s. federal government?

James Madison mentions in The Federalist No. 51.

Quoting a part of the article: "But it is impossible to give each department the same power of self-defense.

In the republican government legislative authority necessarily predominates. The remedy of this inconvenience is to divide the legislature into different branche, trying by means of different systems of choice and different principles of the action, which are as unrelated to each other as the common nature of their functions and their common dependece on society allow".  

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.