In which part of the world was rice first domesticated?

Rice was first domesticated in the regions of China and Southwestern Asia, particularly in the Yangtze River Valley around 9,000 years ago. This region provided the ideal conditions for early cultivation due to its climate, soil, and availability of water sources suitable for paddy farming. The domestication of rice marked a significant development, as it became a staple food that supported population growth and the establishment of complex societies.

In contrast, other regions mentioned in the alternatives, such as South America, Sub-Saharan Africa, and North America, were not the primary centers of rice cultivation. While these areas had their own domesticated crops, rice as a key agricultural product is distinct to East and Southeast Asia, demonstrating the importance of geographic and environmental factors in the development of agriculture. This historical context highlights why China and Southwestern Asia are recognized as the origin of rice domestication.