What is the concept that a law can be reconsidered, and declared unconstitutional?

A) a tariff

B) reserved power

C) judicial review

D) compact

E) implied power

The only answer that makes sense is C, Judicial review. The judicial branch specifically has the power to review laws passed by the legislative and executive branches and invalidate or amend them. Their main purpose in this process is to determine whether a law is constitutional or unconstitutional, and is a check against the other two branches.