which of the following is the part of the ratification prossess in the u.s constitution that has never been used

Question

A) congress calls for national conventional convention
B)congress votes by two thirds majority votes to purpose an amendment
C) three fouths of the states convention ratifiy an ammendment**
D)three fouths of the states legislatures ratify an ammendment

Answer 1

Read carefully:
https://www.washingtonpost.com/opinions/there-are-four-not-two-ways-to-amend-the-constitution/2016/08/18/058afcf2-6420-11e6-b4d8-33e931b5a26d_story.html