Which of the following best describes how the constitution’s authority extended to individual states?

The answer is: only states that ratified it had to obey it.

The United States Constitution constitutes the supreme law of the United States. The Constitution, originally comprising seven articles, outlines the national frame of government. The United States Constitution applies to all of the states making up the union. Since the Constitution came into force in 1789, it has been amended 27 times.

Under the United States Senate: "The Constitution's first three words—We the People—asserts that the government of the United States exists to serve its citizens.