Respuesta :
The correct answer is:
Many settlers were unable to farm the Great Plains due to the challenges of working with the land.
The Great Plains land was not good for farming since it was very dry and flat. Settlers had to learn how to farm in that soil held together by grassroots, called sod. Settlers had to break through the sod to plant crops. Since there was not a lot of wood, they used sod to build homes.