Which one of the following first mooted the idea of a constituent assembly to frame a constitution for India ?

The demand for a Constituent Assembly was first officially mooted in 1934 within the Indian National Congress context when a section revived the Swaraj (Swarajya) Party and pressed for a Constituent Assembly elected on adult franchise (May–June 1934). Contemporary Congress resolutions and histories record this as the first formal demand by Congress circles to have a constitution framed by a representative Constituent Assembly rather than by British authorities, with the demand reiterated in subsequent Congress sessions through the later 1930s [1]. Scholarship on constitution-making also notes the Congress position was repeatedly reasserted in the mid–late 1930s as the accepted route to frame India’s constitution [2].

Sources

1. [1] https://egyankosh.ac.in/bitstream/123456789/43140/1/Unit-6.pdf
2. [2] https://ebooks.inflibnet.ac.in/psp01/chapter/the-constituent-assembly-of-india-functioning/