The Constitution of India was Written in
Option 4 is the right answer.
Constitution of India was written in 2 years 11 months and 18 days.
The Assembly met in sessions open to the public, for 166 days, spread over a period of 2 years, 11 months and 18 days before adopting the Constitution, the 308 members of the Assembly signed two copies of the document (one each in Hindi and English) on 24 January 1950.
The original Constitution of India is hand-written with beautiful calligraphy by Prem Behari Narain Raizada and each page beautified and decorated by artists from Shantiniketan including Beohar Rammanohar Sinha and Nandalal Bose.