GMAT Sentence Correction (SC) | Re: Rallies organized in conjunction with the dissemination

Rallies organized in conjunction with the dissemination of democratic principles
which was once prohibited by Communist Chinese leaders, are beginning to take
shape at a grass roots level permitted by the new Chinese leadership.

(A) Rallies organized in conjunction with the dissemination of democratic principles
which was once prohibited by Communist Chinese leaders, are
(B)Rallies organized in conjunction with the dissemination of democratic principles,
a practice that Communist Chinese leaders