Adapting to Life on the Great Plains

Which adaptation shown below solves the problems settlers in the Great Plains encountered?

Barbed wire was invented. This was a cheap way to fence in an area.

New machinery was invented like John Deere’s sodbuster, a new kind of plow.

Farmers invented “dry farming”. This was a special kind of farming that helped keep moisture in the soil.

Windmills were used to pump water from the ground.

A special kind of wheat was introduced by Russian immigrants. This grew well in the Plains.