Step 1: Understanding the proposal for a Constituent Assembly.
M. N. Roy, a prominent revolutionary and political thinker, first proposed the idea of a constituent assembly to frame the Indian Constitution in 1934. He advocated for the establishment of a constituent assembly that would be elected by the people of India to draft a democratic constitution.
Step 2: Analysis of options.
- (1) M. N. Roy: This is correct. M. N. Roy is credited with proposing the idea of a constituent assembly in 1934, which later became a reality in 1946.
- (2) Jawahar Lal Nehru: Nehru was an important leader in the Indian independence movement but did not propose the idea in 1934. His role came later.
- (3) B. R. Ambedkar: Ambedkar played a key role in drafting the Indian Constitution but did not propose the idea of the constituent assembly.
- (4) Khan Abdul Gaffar Khan: While an important figure in the independence movement, Khan Abdul Gaffar Khan did not propose the constituent assembly.
Step 3: Conclusion.
The correct answer is (1) M. N. Roy.