Answer : 3. "09 January"
Explanation :

Pravasi Bharatiya Divas is celebrated every year on 9 January. Various types of conferences are organized on Pravasi Bharatiya Divas. Pravasi Bharatiya Divas or NRI Day is celebrated every year to commemorate the return of Father of the Nation Mahatma Gandhi to India. Gandhiji returned to India from South Africa on 9 January 1915. This day was celebrated for the first time in 2003.