The Congress, whenever two thirds of both Houses shall deem it necessary,
shall propose Amendments to this Constitution, or, on the Application of the
Legislatures of two thirds of the several States, shall call a Convention for
proposing Amendments, which, in either Case, shall be valid to all intents and
Purposes, as part of this Constitution, when ratified by the Legislatures of three
fourths of the several States, or by Conventions in three fourths thereof....
-Article V of the U.S. Constitution
Article V, excerpted above, is included in the U.S. Constitution to allow for the -
A adaptation of laws to reflect changes in society
B revision of laws by the executive branch
C resolution of conflicts through the judicial system
Dvalidation of elections by a national authority