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
(E) among whom fourteen have official recognition

I Marker C and that is indeed OA. But I am not sure why A and E are wrong. I marked C because I felt it sounded most reasonable