Answer : 4. "मिथिला"
Explanation :

Gargi, Maitreyi, and Kapila were ancient Indian philosophers and scholars. The home of Gargi and Maitreyi was in Mithila, an ancient kingdom that corresponds to the present-day region of northern Bihar and parts of Nepal. Kapila was associated with the Sankhya school of philosophy and is often considered one of the founders of this philosophical tradition.