Answer : 3. "झारखण्ड"
Explanation :

1. The state with the largest coal reserves in India is Jharkhand.

2. Coal reserves in India are mainly located in the older Gondwana formations of peninsular India and the younger Tertiary formations of the north-eastern region.

3. About 80 per cent of the coal reserves in India are bituminous type and belong to the non-coal category.