关于大权426一点新的疑问

1.        India is country with at least fifty major regional languages, of whom fourteen have official recognition.

(A) of whom fourteen have official recognition

(B) fourteen that have official recognition

(C) fourteen of which are officially recognized

(D) fourteen that are officially recognized（C）

(E) among whom fourteen have official recognition

这个题答案无可非议，但是我想弱问一下，C到底是个什么成分？ are 是fourteen的动词还是which的动词？

如果是fourteen的动词的话那岂不是个句子了，而没有连词怎么和前面相接呢？

如果是which的动词的话貌似句意讲不通

谢谢各位了哦