I am going to go ahead and say that your answer is C because regions can end for many reasons and most of which I'm certain of which are affected by the physical characteristics of the region.
I hope that this helps. :)
The Great Depression of 1929-33 was the most severe economic crisis of modern times. Millions of people lost their jobs, and many farmers and businesses were bankrupted. Industrialized nations and those supplying primary products (food and raw materials) were all affected in one way or another.
States like Oklahoma, the panhandle of Texas, Kansas, Colorado and Portions of New Mexico were devastated.
Answer:
(D).The development of large saw mills rapidly expanded the lumber industry in Texas.
Explanation: