Under a provision of the Constitution that was never applied, Congress has been required to call a convention for considering possible amendments to the document when formally asked to do it by the legislatures of two-thirds of the states.

• Awas never applied, Congress has been required to call a convention for considering possible amendments to the document when formally asked to do it  
• Bwas never applied, there has been a requirement that Congress call a convention for consideration of possible amendments to the document when asked to do it formally  
• Cwas never applied, whereby Congress is required to call a convention for considering possible amendments to the document when asked to do it formally  
• Dhas never been applied, whereby Congress is required to call a convention to consider possible amendments to the document when formally asked to do so  
• Ehas never been applied, Congress is required to call a convention to consider possible amendments to the document when formally asked to do so