In Early Riverine China,which of the Following Best Describes the Rate

In early riverine China,which of the following best describes the rate of urbanization and the factors that contributed to it?

A) Urbanization took place more rapidly in China than in Egypt and Mesopotamia,as the rice-growing regions in the south shared information with the millet-growing regions in the north.
B) Urbanization in China was slower than in Egypt and Mesopotamia because China did not have outside trade.
C) Urbanization in China was slower than in Egypt and Mesopotamia because of geographic barriers and lack of easily domesticated plants and animals.
D) Urbanization in China took place more rapidly than in Egypt and Mesopotamia because China's open geography allowed for the rapid diffusion of intellectual and cultural breakthroughs from other parts of Afro-Eurasia.