Step 1: Understanding the Concept:
The Constituent Assembly was the body tasked with drafting the Constitution for independent India.
Step 2: Detailed Explanation:
The Assembly held its first meeting on December 9, 1946.
The final draft of the Constitution was adopted on November 26, 1949.
The total time taken by the Assembly to complete its task was 2 years, 11 months, and 18 days (often cited as 17 days in several exam sources excluding the final day).
Based on the given options, (B) is the standard correct answer for this duration.
Step 3: Final Answer:
The duration was two years, eleven months, and seventeen (or eighteen) days.