The correct option is D Surat
The congress was divided into two camps-Extremist and Moderates at the Surat session of 1907. The Moderates believed in the constitutional methods of protests like petitions, prayers, meetings,etc. Extremists, on the other hand, believed in agitation, strikes and boycotts to force their demands. This difference in ideologies was one of the main reasons that led to the split in the Congress.