The answer is: B) It stretched from Texas to Kansas, providing a trail for cowboys and cattle to the railroad.
Before the railroad technology used for animals distribution, the Chisholm trail was a major distribution route for cattle companies in Texas. At that time, Kansas did not have a lot of cattle farms, so the price of the cattle could be 5-10 times higher compared to the price on Texas.
So the cattle companies often hired cowboys to lead the cattle through the Chisholm trail and deliver the products to Kansas and sell them there.