Answer:
The correct answer is C. The Caprock Escarpment is the boundary between the Great Plains and West Texas.
Step-by-step explanation:
The Caprock Escarpment is a geological and geographic boundary in the state of Texas that marks the transition between the High Plains and Llano Estacado in western Texas, and the Great Plains to the east; that is, it demarcates the completion of the Great Plains in the territory of the state. Its extension is 200 miles in the southwest direction, and it marks the delimitation of a climatological system of abundant rains and storms in the area of West Texas.