The canal system was one development during the Han and Tang dynasties that contributed to the increased population of southern China.
The correct answer is the canal system. The canal system was a major development during the Han and Tang dynasties that contributed to the increased population of southern China. To find the answer, you can analyze the historical events and developments that occurred during those dynasties and their impact on population growth in southern China. Specifically, the construction of an extensive canal system played a vital role in promoting agricultural productivity and transportation, allowing for the expansion of agriculture and trade in the region.
