The changes in technology and infrastructure that most promoted the growth of agriculture in the American West is Railroads, because they gave access to markets.
Therefore option C is correct
The American railroads was a rail transportation network that linked several parts of the United States. The rail network was an important booster of the American economy because of its tremendous effect in facilitation trade and commerce.
Among other things, the railroad opened the way for the settlement of the West, provided new economic opportunities, stimulated the development of town and communities, and generally tied the country together.
The railroad was one of the technological advances that helped promote agriculture because they gave access to markets.
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