Which describes one reason for the end of long cattle drives?

a.
cattle were forced off the prairie by enormous herds of buffalo.

b.
as homesteaders moved into areas along cattle trails, they fenced their farms.

c.
demand for beef declined drastically in the years after the civil war.

d.
cowboys became dissatisfied with low wages and went on strike.

B is the correct answer. As more people began to settle, more homes and fences were built. Thus more obstacles for those performing a cattle drive. It would take much longer to go around the new barbed fences than through the land. Some fences might stretch for several miles, making a cattle drive a longer trip. This is one of the reasons cattle drives ultimately stopped. :D