The answer is: B
Explanation
The correct option is B: People of India.
The preamble of the Constitution of India states that it is the people of India who have adopted, enacted and given to themselves this Constitution. The Constituent Assembly was only a representative body of the people of India, and it acted on their behalf to frame the Constitution. The Indian President and the Indian Parliament had no role in the adoption and enactment of the Constitution, as they were formed after the Constitution came into force on January 26, 1950.
Some additional sentences are:
v The Constitution of India is the supreme law of the land, and it reflects the aspirations and values of the people of India.
v The Constitution of India is also the longest written constitution in the world, with 395 articles, 22 parts and 12 schedules.
v The Constitution of India is a living document, which can be amended by the Parliament to meet the changing needs and challenges of the nation.