Which of the following is the best example of the principle of checks and balance?
a) The President vetoing a bill passed by Congress
b) The Supreme Court ruling a law unconstitutional
c) Congress impeaching a President
d) The President appointing a Supreme Court Justice
The best example of the principle of checks and balances is b) The Supreme Court ruling a law unconstitutional. This exemplifies the principle because it demonstrates how the judicial branch can check the legislative branch by declaring a law passed by Congress unconstitutional.