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

1. The question asks which party or conference first mooted the idea of a constituent assembly to frame a constitution for India. 2. The idea of a Constituent Assembly elected by the people was first put forward compellingly by M.N. Roy in 1934. 3. Following this, the Swaraj Party, which was a group within the Indian National Congress, formally adopted a resolution demanding a Constituent Assembly in 1934/1935. 4. The Indian National Congress officially demanded it later, in 1935 and reiterated it subsequently. 5. The Muslim League's focus was different, and the All Parties Conference (like the one in 1928 related to the Nehru Report) predated the formal demand for a Constituent Assembly in this specific context. 6. Therefore, the Swaraj Party in 1934 is credited with being the first major political entity to formally propose the idea.