The first alternative is correct (A).
The American Constitution is based on the Federalist ideal. Federalism is a political system in which states unite to form a broader organization that will represent them as a nation, a Central State. In this type of system, states maintain their autonomy, so that the states that make up the country are sovereign in their laws and decisions.
The Constitution gives final authority to the National Government in regards to the way the country is to be run. For example the Supreme Court which is a federal authority has ultimate rule in regards to issues of constitutionality.
The Constitution gives full sovereignty to the national government, as established by the Supremacy Clause in Article VI, which asserts that federal laws take precedence over state laws. This ensures that the national government functions as the ultimate authority in the U.S. legal system. Thus, the correct answer to the question is D. the national government.
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