कोणत्या वर्षी ब्रिटीश सरकारने प्रथमच संविधान सभेची स्थापना करण्याची मागणी मान्य केली ?

The correct answer is Option C (1940).

Key Points:
• Recognition of the Demand for Constituent Assembly:
• The idea of a Constituent Assembly for India was first put forward by M.N. Roy in 1934.
• In 1935, the Indian National Congress (INC) officially demanded a Constituent Assembly to frame the Constitution of India.
• The British Government accepted this demand in principle for the very first time in the 'August Offer' of 1940 announced by Viceroy Lord Linlithgow.
• The August Offer explicitly stated that the framing of the new Constitution after the end of World War II would be primarily the responsibility of Indians themselves.
• Later, the Cripps Mission (1942) and finally the Cabinet Mission Plan (1946) concretized and executed the actual formation of the Constituent Assembly.
• Thus, the British Government accepted the demand for the first time in 1940.
• Key Takeaway: The British Government accepted the demand for an Indian Constituent Assembly for the first time in the August Offer of 1940.