Final answer:
The final step before a bill becomes a federal law is that the A. President signs or vetoes a bill passed by Congress.
Step-by-step explanation:
For a bill to become a federal law in the United States, it must pass both chambers of Congress (the House of Representatives and the Senate) by a majority vote. After approval, it goes to the President, who can sign it into law or veto. Congress can override a veto with a two-thirds majority vote in both chambers.
Thus, the final step before a bill becomes a federal law is that the President signs or vetoes a bill passed by Congress. If the President signs the bill, it becomes law. If the President vetoes the bill, meaning they reject it, the bill must be passed again with a two-thirds majority vote in both the House of Representatives and the Senate to override the veto and become law.