Q. Who among the following was the first person to put forward the idea of a Constituent Assembly?
Answer: C
Notes:
Explanation: It was in 1934 that the idea of a Constituent Assembly for India was put forward for the first time by M.N. Roy, a pioneer of communist movement in India.
In 1935, the Indian National Congress (INC), for the first time, officially demanded a Constituent Assembly to frame the Constitution of India.
Source: Laxmikanth’s Polity

