the answer would actually be C. the decline of the Roman Empire -> the emergence of the feudal system -> the Crusades -> the emergence of towns and a middle class. Its C
The question is asking to state or describe how both groups used land, and how their ways of life conflicted, and base on my research, I think the best way to explain it is that they have conflict on their interest of the resources found on each land of the Great Plains. I hope this would help
I want to say it is D, because I believe it was in Harpers Ferry where the fight occurred and he lost his (I believe) 5 sons and his own life afterwards.