What document grants Congress the authority to regulate business activities?

The correct answer is based on the United States Constitution, specifically Article 1, which outlines the powers of Congress. Among the powers granted to Congress is the authority to regulate commerce among the states, known as the Interstate Commerce Clause. This clause has been interpreted broadly to allow Congress to regulate a wide variety of business activities that may affect interstate commerce, leading to significant federal regulatory power over industries and the economy as a whole.

The Interstate Commerce Clause is crucial because it helps maintain a consistent regulatory environment across state lines, preventing individual states from imposing conflicting regulations on commerce that crosses state borders. This aspect of the Constitution has been pivotal in upholding federal laws that govern economic activities, trade, and even labor relations, shaping the landscape of American business law.

Other options such as Article 3 deal with the judicial branch and its powers, while the Bill of Rights focuses on individual rights and liberties, rather than congressional authority over business activities. The Administrative Procedure Act, on the other hand, sets forth procedures for federal agencies but does not grant Congress the authority itself. Thus, the combination of Article 1 and the Interstate Commerce Clause is the correct basis for Congress's authority to regulate business activities.