The phrase that would most accurately complete the diagram is B. reduced storage and shipping costs for farmers.
According to history, the rise of populism was settled by the passage of Granger laws, especially in Minnesota, Iowa, Wisconsin, and Illinois, in the late 1860s and early 1870s. The Granger laws regulated rising fare prices of railroad and grain elevator companies after the American Civil War.
The government intervened to regulate railroad and other monopolies as it affected farmers.
Thus, the progression started with the rise of populism, followed by the passage of Granger laws, and then the reduction of prices for farmers.
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