Which of the Following Was Not a Reason the Days

Which of the following was not a reason the days of the open range and great cattle drives came to an end after the mid-1880s?

A) The ranges were overgrazed and too crowded.
B) Severe winters and dry summers in 1885 and 1886 caused severe hardships.
C) The demand for beef declined as more people turned to cheaper food.
D) The expansion of the railroads throughout the West cut across grazing areas.
E) Cattle prices declined.