Which of the following statements is false?

a. There is no moral theory spelled out in the Constitution, but it is nevertheless based on an underlying moral theory.
b. The Founders' use of "auxiliary precautions" is based on the assumption that human virtue could fail.
c. The main purpose of a federal structure, as understood by the Framers of the Constitution, was to concentrate sovereignty in a single power (the federal government), thus removing sovereignty from the states.
d. The Constitution specifically stated that all laws of Congress would be the supreme law of the land, no matter what any state constitution or state laws should say to the contrary.