Why Were There Violent Clashes Between Cattle Ranchers and Farmers

Why were there violent clashes between cattle ranchers and farmers during the late 19th century?

A) Farmers were using barbed wire to keep roving livestock out of their crops.
B) Ranchers tended to be African American or Mexican-American, while farmers tended to be Irish or German immigrants.
C) Farmers paid high land taxes, while cattle ranchers paid only a small sales tax on each steer sold at market.
D) Ranchers wanted to fence off the lands to keep their cattle from roaming too far from home, which conflicted with the need for farmers to expand their land in order to be profitable.
E) In general, farmers had been soldiers in the Union army, while cattle ranchers had served in the Confederate army, so they were fighting a continuation of the War Between the States.