Why did the Constitution not get signed right away?

One of the most famous reasons for why certain delegates didn't sign was that the document lacked a legitimate Bill of Rights which would protect the rights of States and the freedom of individuals. Three main advocates of this movement were George Mason, Elbridge Gerry, and Edmund Randolph.

Explanation:

America's littlest state had a big independence streak. Rhode Island, distrustful of a powerful federal government, was the only one of the 13 original states to refuse to send delegates to the Constitutional Convention

the correct answer is d

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.