Between 1870 and 1910, the Possibility of Profiting from Commercial

Between 1870 and 1910, the possibility of profiting from commercial farming in the Plains region became more favorable because

A) railroad expansion and the construction of grain elevators made it possible to meet the increasing demand for farm products.
B) low interest rates on property-acquisition loans made it possible to acquire more productive farmland.
C) federally subsidized irrigation projects cut the cost of making formerly arid land productive.
D) the establishment of parity prices for basic commodities substantially increased per capita farm income.