The correct answer is (c), November 26, 1949.
The Constituent Assembly of India adopted the Constitution of India on November 26, 1949. It came into effect on January 26, 1950. The Constitution of India is the supreme law of India. It provides for a parliamentary system of government with a President as the head of state and a Prime Minister as the head of government. The Constitution also guarantees certain fundamental rights to all citizens of India.
(a) January 26, 1950 is the date on which the Constitution of India came into effect. However, it was adopted on November 26, 1949.
(b) February 11, 1948 is the date on which the Indian National Congress adopted the Objectives Resolution, which laid the foundation for the Constitution of India.
(d) None of the above dates is the correct answer.