The Congress whenever 2/3 of the house show deem it necessary so propose amendments to this constitution on the application of the legislature of 2/3 of the several States so 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 on three fourths of the several States or by conventions in 3/4 as the one or the other modify a ratification maybe proposed to by the Congress which of the following best summarizes this excerpt

This excerpt describes the process by which amendments to the constitution can be proposed and ratified. It states that if 2/3 of the House of Congress deems it necessary, they can propose amendments. Alternatively, if 2/3 of the state legislatures call for a convention, amendments can also be proposed. In both cases, the proposed amendments are valid when ratified by 3/4 of the state legislatures or by conventions in 3/4 of the states. The process of proposing and ratifying amendments can be modified by Congress.