The correct answer is Only a. Key Points The Constituent Assembly was Constituted in November 1946 under Cabinet Mission Plan. On 26 January 1950, the constitution took effect (commemorated as Republic Day), and the Constituent Assembly became the Provisional Parliament of India (continuing until after the first elections under the new constitution in 1952). Hence statement 1 is Not correct. It is a general trivia that, On the day the Constitution was being signed it was drizzling outside and it was interpreted as a sign of good omen. Hence statement 2 is correct. The Constituent Assembly of India as a sovereign body, which was formed on the recommendations of the Cabinet Mission which visited India in 1946 Constituent Assembly was constituted on 9th December 1946. Additional Information The total membership of the Constituent Assembly was 389 of which 292 were representatives of the provinces, 93 represented the princely states and four were from the chief commissioner provinces of Delhi, Ajmer-Merwara, Coorg and British Baluchistan. Vallabhbhai Patel served as the First Deputy Prime Minister until his death on 15 December 1950. Jawaharlal Nehru took charge as the first Prime Minister of India on 15 August 1947 and chose 15 other members for his cabinet.