求帮忙看看一道时态题目~

陈小萌爱gmat

76.        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.
(A)        was never applied, Congress has been required to call a convention for considering possible amendments to the document when formally asked to do it
(B)        was 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
(C)        was never applied, whereby Congress is required to call a convention for considering possible amendments to the document when asked to do it formally
(D)        has never been applied, whereby Congress is required to call a convention to consider possible amendments to the document when formally asked to do so
(E)        has never been applied, Congress is required to call a convention to consider possible amendments to the document when formally asked to do so