The correct answer is (b). The Constitution of India was adopted on November 26, 1949, and came into effect on January 26, 1950. The Constituent Assembly was set up on December 9, 1946, to draft the Constitution. The Assembly had 389 members, of whom 292 were elected from the provinces and 93 were nominated by the princely states. The Assembly met for the first time on December 11, 1946, and the Constitution was adopted on November 26, 1949. The Constitution came into effect on January 26, 1950, which is celebrated as Republic Day in India.
(a) January 26, 1950: This is the date on which the Constitution of India came into effect. However, the Constitution was adopted on November 26, 1949.
(c) February 11, 1948: This is the date on which the Constituent Assembly was first elected. However, the Assembly did not meet until December 11, 1946.
(d) None of the above: This is the correct answer.