The Bison Hills are full of thick, dense forests. But some areas have large tracts of cleared land. Some tracts also seem to be burnt. What do you think these tracts of land are being used for?

The correct option is D Podu agriculture
Podu, or slash-and-burn, is an agricultural practice where a patch of forest is cleared and burnt away. Seeds are sown in this cleared area; and the crops are then grown and harvested. The process is repeated. As a patch of land loses fertility, a new patch of land is identified for podu.