The basic or "organic" law of the United States is:

The U.S. Constitution is often referred to as the basic or "organic" law of the United States because it serves as the fundamental legal framework for the country. It establishes the structure of government, delineates the powers and responsibilities of each branch, and enshrines the rights of individuals. The Constitution is the supreme law of the land, meaning that any laws or treaties made must be in accordance with it, and it can only be amended through a rigorous process, which underscores its foundational role in the legal system.

While common law and statutes have their importance, they derive their authority from the framework established by the Constitution. The Bill of Rights, comprising the first ten amendments to the Constitution, specifically protects individual liberties but is a part of the Constitution rather than the foundational document itself. Therefore, the Constitution holds the primary place as the organic law, guiding not only the government but also the society it governs. This makes it the correct answer in this context.