The correct answer is "Over time, the settlers who stayed where able to adapt and modify the landscape of farming."
The sentence of the article that best supports the thesis is "Over time, the settlers who stayed where able to adapt and modify the landscape of farming."
The settlers that traveled to the plains and stayed there were determined to make things work. In the beginning, they lacked the infrastructure or proper conditions and tool to work the field, but through perseverance, patience, trial, and error, they could modify and adapt the land conditions to have good farming activity and good crops.