The Supreme Court's Interpretation of Federalism Over the Late Nineteenth

Multiple Choice

The Supreme Court's interpretation of federalism over the late nineteenth and early twentieth centuries kept Congress from passing many industrial regulations, including ones involving working hours and child labor, because justices held that:

A) industrial regulation was a reserve power under the Tenth Amendment.
B) manufacturing plants were not engaged in interstate commerce, and as such could only be regulated by states.
C) the commerce clause did not allow any regulation of factories, only direct trade and transportation to markets.
D) the regulations infringed upon manufacturers' contract liberty under the Constitution's contract clause.