After 1834 till 1920, ships left from the ports of India on regular basis carrying people of various religions, gender, classes and castes destined to work for a minimum of five years on one of the plantations in Mauritius. Which Indian state remained the central recruiting ground for such migration?

Bihar

The correct answer is Option 2: Bihar.

NCERT:  After 1834 till 1920, ships left from the ports of India on regular basis carrying people of various religions, gender, classes and castes destined to work for a minimum of five years on one of the plantations in Mauritius.  For many decades, the recruiting ground was centred in Bihar, in particular, in districts, such as Patna, Gaya, Arrah, Saran, Tirhoot, Champaran, Munger (Monghyr), Bhagalpur and Purnea. (Pineo 1984)