After the Civil War, ______ became a strong trend in American economy.A.disappearance of private businessB.increase in capital investmentC.monopoly by big businessD.nationalization of enterprises-湖北继续教育网网校

[单选题]

After the Civil War, ______ became a strong trend in American economy.

A.disappearance of private business
B.increase in capital investment
C.monopoly by big business
D.nationalization of enterprises