29. The supreme law of the land is*a state constitutiona U.S. treatythe U.S. Constitutiona law passed by Congress

The answer to the question regarding what constitutes "the supreme law of the land" is the U.S. Constitution.

Explanation

The U.S. Constitution is established as the highest legal authority in the United States. It dictates that federal law takes precedence over state laws and any other forms of legislation. This principle is affirmed in the Supremacy Clause, found in Article VI, Clause 2 of the Constitution, which establishes the Constitution, federal laws, and treaties made under its authority as the supreme law. Hence, if there are conflicts between these laws and state laws, federal law prevails.

In summary, the correct answer is: the U.S. Constitution.