Answer:
A. They shipped certain crops for free.
Step-by-step explanation:
Prior to the creation of the railroads, the areas in West Texas was inhabitable.
So, the railroad company decided to create a program to ship certain crops for free. (most of these crops were considered to be 'Cash crops', the type of crops that provide the largest profit)
Because of this, Many farmers decided to move to West Texas. The Farmers see an opportunity to use the free shipment as a cheap methods to distribute their crops to other territory and get profit for themselves.