The introduction of Champa rice from its home of origin to China during the 11th century c. e. best illustrates an example of which of the following? A. The influence of China on neighboring societies
B. The stimulation of agriculture by technological innovation
C. The importance of Vietnam to the world economy
D. The reliance of China on food imports

D.The reliance of China on food imports

Explanation:

China has always been a very heavily populated country, in fact, during most of human history, it has been the most populated country in the world, and even if China has a very fertile plain in the middle of the country, the domestic agricultural output has often been insufficient to feed the Chinese Population.

For this reason, China has relied on imports throughout history, and Vietnam has been one of the most important sources of those imports, because of the geographical proximity. Champa rice, a staple Vietnamese product, found its way to China in this manner.

the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.