Which factor best explains the diffusion of rice cultivation from East Asia to South Animals like horses and camels transported rice seeds across deserts. River systems in Europe spread rice farming beyond East Asia. Climatic changes made rice a more viable crop in arid regions. Trade networks and migration brought rice farming techniques to new regions.

The factor that best explains the diffusion of rice cultivation from East Asia to South Asia is:<br /><br />**Trade networks and migration brought rice farming techniques to new regions.**<br /><br />Rice cultivation spread from East Asia to other parts of the world primarily through trade networks and migration. As people moved and traded goods, they also brought with them agricultural knowledge and techniques. This exchange of information allowed rice farming to spread beyond its original region.