Modern India National Movement

In the context of the re-organization of the Indian National Congress (INC) based on linguistic principles, the significant session held in 1920 was the Nagpur session. This session marked a pivotal shift as the INC recognized the linguistic organization as an important factor in restructuring its provincial units.

The key points regarding the Nagpur session include:

• The Nagpur session took place in December 1920, a time when the INC was increasingly aligning its policies with the demands of various linguistic groups in India.
• This decision was a strategic move to enhance the effectiveness and representativeness of the INC by acknowledging cultural and linguistic diversity within its structure.
• At this session, the INC decided that the organizational structure would align more closely with the country's linguistic demographics, facilitating stronger local participation and engagement in political processes.

Thus, the correct answer is Nagpur.