Who has the authority to sign bills into law?

The authority to sign bills into law lies with the President of the United States. Once both houses of Congress—the House of Representatives and the Senate—approve a bill, it is sent to the President for signature. By signing the bill, the President formalizes it, thereby transforming it into law. If the President does not agree with the bill, they have the option to veto it, returning it to Congress with their objections. This process is important as it highlights the checks and balances established in the federal government, ensuring that no single branch holds unchecked power.

In this scenario, none of the other options have the authority to sign bills into law. The Vice President's primary role is to support the President and preside over the Senate, while Congress is responsible for drafting and voting on legislation but not for signing it into law. The Supreme Court, as the judiciary, interprets laws rather than enacting them. Thus, the President is the correct answer for who has the authority to sign bills into law.