Correct Answer: (a) 2 Years, 11 Month, 18 Days
Solution:The Constituent Assembly took 2 years, 11 months and 18 days to complete its historic task of drafting the Constitution. During this period, there were 11 sessions covering a total of 165 days. On 26 November 1949, the last day of the 11th session, the constitution was adopted. Apart from these eleven sessions, one more meeting was held on 24 January, 1950 in which the members appended their signature. So, the nearest correct answer is option (c).