I’m not to sure but pretty sure it’s B
C. Antarctica because the rest are well put together. That is my best choice.
The flags that were placed by people who landed there
The geography of the United States impacts the possible regions people settle in.
Areas that tend to be flat (or small amounts of small hills) tend to be the most population areas because it is easier to build houses, apartments, etc etc. However there is very few places people have settled where National Parks and Mountains are located because it is unstable and extremely difficult to make a house in that region.