The adoption of the Constitution of India on 26th November 1949 is a significant event in the history of India. The correct answer to the question of who adopted the constitution is "Representative of the people of India in constituent Assembly."

Explanation:

1. Constituent Assembly: The Constituent Assembly was formed in 1946 to draft a constitution for India. It was made up of elected representatives from different parts of India.

2. Constitution Drafting: The Constituent Assembly took almost three years to draft the Constitution of India. It was a long and complex process that involved debates, discussions, and deliberations.

3. Adoption of the Constitution: Finally, on 26th November 1949, the Constitution of India was adopted by the Constituent Assembly. It was a momentous occasion that marked the culmination of years of hard work and dedication.

4. People's Representatives: The adoption of the Constitution of India was done by the representatives of the people of India who were members of the Constituent Assembly. These representatives were elected by the people of India to draft a Constitution that would govern the country.

5. Significance: The adoption of the Constitution of India marked the establishment of India as a democratic republic. The Constitution laid down the fundamental principles of governance and provided a framework for the functioning of the government.

In conclusion, the adoption of the Constitution of India on 26th November 1949 was done by the representatives of the people of India who were members of the Constituent Assembly. It was a historic event that marked the establishment of India as a democratic republic.