The answer is either A. or D.
I would love to help you but you have to let me know what book the questions are asking about.
Answer:
D. to control the water of the river's
The correct answer is Cotton.
Texas was a great area for cotton because of the vast amounts of land that were farmed and because of the amazing climate. They also had slaves so they could have them work on those farms and produce cotton which was the main thing in their economy.
