American Government CLEP Prep Practice Exam 2025 - Free Practice Questions and Study Guide

The President of the United States has the power to sign or veto bills passed by Congress. This is because the president holds the executive power in the United States and is responsible for enforcing the laws created by Congress. The Supreme Court, on the other hand, is responsible for interpreting the laws and determining their constitutionality. While Congress does have the power to pass bills, they still require the signature of the president to become law. State governors also have the power to sign or veto bills passed by their state's legislature, but this authority does not extend to the entire country as it does with the President of the United States. Therefore, the correct answer is A.