Final answer:
Judicial review is the power of the courts, including the Supreme Court, to examine and potentially invalidate legislative and executive actions that violate the Constitution. This principle, which was formalized in Marbury v. Madison in 1803, is intrinsic to the system of checks and balances in the U.S. government. The correct answer is The power of the Supreme Court to declare an act of another branch unconstitutional.
Step-by-step explanation:
Principle of Judicial Review
The principle of judicial review is the power of the Supreme Court and lower courts to examine the actions of the legislative and executive branches of government and determine whether these actions are Constitutional. Established by the landmark case Marbury v. Madison in 1803, judicial review allows the courts to render a law or an official governmental act void if it is found to be unconstitutional. In terms of official options given, the correct answer to the student's question is the power of the Supreme Court to declare an act of another branch unconstitutional.
This is a critical component of the checks and balances system designed to prevent any one branch of the U.S. government from becoming too powerful. While the concept of judicial review is not explicitly mentioned in the Constitution, it has been a fundamental aspect of the judicial system since its assertion by Chief Justice John Marshall.