Which factor best explains the diffusion of rice cultivation from East Asia to Southeast Asia 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 Southeast Asia is:<br /><br />**Trade networks and migration brought rice farming techniques to new regions.**<br /><br />Rice cultivation spread from East Asia to Southeast Asia primarily through the movement of people and the exchange of agricultural knowledge and practices. As people migrated and established trade routes, they brought with them the knowledge of rice cultivation, which then spread to neighboring regions. This process of cultural and technological diffusion allowed rice farming techniques to be adopted and adapted in new areas, facilitating the spread of rice cultivation.