The correct options are
B Dr. Pandurang Sadashiv Khankhoje
C Bhai Parmanand
D Lala Hardayal
The Gadar organisation was a revolutionary group, started by Indians living in America and Canada. Lala Hardayal, Bhai Parmanand, Dr. Pandurang Sadashiv Khankhoje were some of the important leaders of this organisation.