The factor that helped the United States in making the inland transportation and commerce to be possible is in letter C. The intricate river system. I hope you are satisfied with my answer and feel free to ask for more if you have clarifications and questions.
Your answer I believe would be D “urban sprawl”- scattered development that increases traffic, saps local resources and destroys open space
Omaha and Sacramento is the answer
I believe it is called <span>intrusive igneous.
Hope this helps,
♥<em>A.W.E.<u>S.W.A.N.</u></em>♥</span>
