Answer: It was called serfdom.
Explanation:
Serfdom is a bondage with a manor or lord to work on a small piece of land during the Middle Ages. This is done in exchange for protection. A serf is attached to the land and cannot leave it unless. Also, it is inherited status in life passed to their children.
A. All of these <span> It won't let me answer unless there are 20 characters so I added this pointless sentence.</span>
It would be B, differences in elevation.
Explanation: Its the panhandle. So it's hotter there than it would be in other places of the state. There's mesas up there too like the Black Mesa, which is Oklahoma's highest point, standing at 4,973 feet. Plus its further to the North than it is the East which makes it more susceptible to fluctuations in temperature.