Which of the following is NOT a responsibility of Congress?

The correct response is that granting pardons is not a responsibility of Congress. This power is specifically designated to the President of the United States under Article II, Section 2 of the Constitution. The President has the authority to grant reprieves and pardons for offenses against the United States, excluding cases of impeachment.

In contrast, the other options are indeed responsibilities of Congress. Declaring war is a fundamental power granted to Congress under Article I, Section 8. Regulating interstate commerce is also a key responsibility of Congress, allowing it to manage trade and economic relationships between states, which is outlined in the same section. Coining money is another power explicitly given to Congress, ensuring a uniform currency and regulating its value, also found in Article I, Section 8. Understanding these distinct roles is crucial for recognizing the separation of powers and the specific functions assigned to each branch of government in the U.S. governance system.