Which of the Following Does NOT Characterize the American Economy

Which of the following does NOT characterize the American economy in the 1840s and 1850s?

A) Transportation improvements on land and water, especially the rise of the railroad, transformed the American economy.
B) Agriculture remained largely unaffected by technology, and thus diminished in importance as a component of the market economy.
C) The maturing factory system employed a growing industrial workforce, increasingly foreign-born.
D) Water power was increasingly being replaced by steam power.