The North Central Plains is separated from the rest of Texas by the A. Great Plains and Mountains and Basins regions. B. Caprock Escarpment and Gulf of Mexico. C. Balcones Escarpment and Caprock Escarpment. D. Balcones Escarpment and the Rio Grande.
The answer should be A. Great Plains and mountains and basins regions Caprock Escarpment is found to the west, the Edwards plateau is found to the south, and the Eastern Cross Timbers to the east.