Based on the map how did the plague most likely spread to India?

Explanation:

The point of origin for the Black Death was most likely a population of marmots—small, prairie-dog like rodents—in Central Asia. ... The 1330s outbreak also spread west across Central Asia via traders using the Silk Road.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.