Which of the Following Caused the Era of Dual Federalism

Which of the following caused the era of dual federalism to end?

A) The federal government tried to impose a national income tax.
B) President Hayes ordered federal troops to remain in the South for at least two more decades.
C) The Supreme Court upheld legislation that outlawed child labor.
D) The United States entered World War I, and national security became paramount.
E) Citizens looked to the federal government to address problems created by the Great Depression.