The correct option is "C".
During the mid-1880s open-range cattle came to an end. The 'open range' or unfenced land which had been free for anyone to use, started to be fenced with barbed wire by the ranchers. Besides, during the 1886 spring, there was a fall in beef prices due to the extreme weather conditions that damaged half the cattle. A terrible hot summer followed by a winter storm in which the temperature dropped to -43°C killed thousands of cattle on the plains.