Why were agricultural tracts incorporated within the fortified area of the Vi jayanagara Empire?

The correct option is "To protect the agricultural belt itself".

In the Vijayanagara Empire, agricultural tracts were incorporated within the fortified area for strategic and military reasons, primarily related to siege tactics. During medieval warfare, besieging armies would often surround a capital or fort for months or even years, attempting to starve the inhabitants into submission by cutting off food supplies from the outside.

By enclosing vast agricultural lands, fields, and forests within the massive fortified walls, the rulers of Vijayanagara ensured that they could grow and store food locally. This prevented enemy forces from destroying or capturing the crops, thereby protecting the agricultural belt itself and ensuring a continuous food supply to withstand prolonged sieges.