Answer : 2. "29th August, 1947 "
Explanation :

On 29 August 1947, the Constituent Assembly set up a Drafting Committee under the Chairmanship of Dr. B.R. Ambedkar to prepare a Draft Constitution for India. While deliberating upon the draft Constitution, the Assembly moved, discussed and disposed of as many as 2,473 amendments out of a total of 7,635 tabled.