How did barbed wire change farming?
a. it stopped ranchers from stealing their crops.
b. it stopped miners from blasting their crops with water.
c. it stopped livestock from destroying their crops.
d. it stopped wild animals from eating their crops.

C. It stopped livestock from destroying their crops.

Explanation:

Barbed wire is the creation of wires that limited the open range of the livestock, and with that also created limits for the land that ranchers had, this was usefull for farming because since it was mainly used to keep livestock in a certain land, the cattle wasn´t able to get out of their lands and go eat the crops that the farmers were growing.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.