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.
A. seafloor spreading at mid-ocean ridges
False because of the light rain won't help much at all and the soil might help because it's kinda like sand
I would say B. Ever hear the phrase, "warm air rises"?
