[求助]大全690

690.        The argument that the dominant form of family structure today is not the nuclear family, but rather it is a family which is modified and extended, is based on a number of facts: the existence of three-generational families, the amount of vertical and horizontal communication between family subunits, and the extent to which family members offer assistance to one another.

(A) family, but rather it is a family which is modified and extended, is based on a number of facts: the existence of three-generational families

(B) family, but is instead a family that is modified and extended, is based on a number of facts: three-generational families exist

(C) family, which has been modified and extended, is based on a number of facts: the existence of three-generational families

(D) family but a modified extended family is based on a number of facts: the existence of three-generational families（D）

(E) family, but also a modified and extended family, is based on a number of facts: three-generational families exist

答案 d, 能解释一下吗？

我总觉得A比D好，不明白

请nn解释一下A的错误是不是 not。。。but rather 后面不能有主语？？还是modified and extended有问题？？

如果把but rather前面的逗号去掉了会不会就好了？？