When was the conference organized in Rohtak under the chairmanship of Pandit Rambhaj Dutt, in which it was decided to give action to Gandhiji's non-cooperation movement?

When was the conference organized in Rohtak under the chairmanship of

1.	When was the conference organized in Rohtak under the chairmanship of Pandit Rambhaj Dutt, in which it was decided to give action to Gandhiji's non-cooperation movement?
A.	in January 1919
B.	in November 1919
C.	in November 1920
D.	in September 1921
Answer» D. in September 1921