The correct answer is A) The Yangtze River was a barrier from invasions.
The statement that best explains the importance of the Yangtze River to ancient Chinese civilizations is "The Yangtze River was a barrier from invasion."
Ancient China was a difficult country to invade because it has major physical or geographical barriers, as is the case of the Yangtze River. It is a long river. Indeed, is the longest river on the Asian continent. This river played a major role in the development of the Chinese civilization because Chinese people used these waters to irrigate the farm fields to produce good cash crops. The river also was used for navigation purposes to transport people and goods.
Other important physical barriers in China are the Yellow River, the Gobi Desert, and the Himalayas.