I would say A.
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The definition of impetuous is something that moves with a lot of force or done with little thought.
I believe the answer is: because then the Bill of Rights would cover both state and federal law.
The bill of rights was the first 10 amendment which created by James Madison. By covering both state and federal law, the bill of rights would be able to product the basic right of united states citizens without providing any chance for the government to overturn them.