Answer:
a) It established the power to declare laws unconstitutional.
Explanation:
The Marbury v. Madison decision is often recognized as establishing the ability of the US Supreme Court to undertake judicial reviews as a landmark ruling in American history. Through judicial review, courts may deem some legislation unconstitutional. It is because of this that courts are able to guarantee that the government's actions fall within the limitations of the Constitution. After Marbury v. Madison, judges now have the power to decide whether or not a piece of law violates the Constitution.
