Answer : 3. "02 दिसंबर"
Explanation :

The International Day for the Abolition of Slavery, 2 December, marks the date of adoption by the General Assembly of the ‘United Nations Convention for the Suppression of Trafficking in Persons and the Exploitation of the Prostitution of Others’. On the International Day for the Abolition of Slavery, the world remembers the victims of the past – particularly the transatlantic slave trade during which millions of Africans were driven from their homes, exploited, brutalized or killed.