When did the Constitutent Assembly adopt the Constitution of India?

26th November 1949

The correct answer is Option 1 - 26th November 1949

The Constitution of India was adopted or enacted by the Constituent Assembly on November 26, 1949. This marked the finalization of the document after extensive deliberations and drafting.

The Constitution came into effect on January 26, 1950. This is the date India officially became a Republic and the Constitution became the supreme law of the land.