With an estimated length of 5,464 kilometers, the Yellow River, or Huang He, is China's second-longest river after the Yangtze River and the world's sixth-longest river valley.
The Yellow River gets its name from the fact that its waters contain silt, which gives the river its yellow-brown color, and when the river overflows, it leaves a yellow residue behind.
While the river contributes to the creation of fertile soil suitable for cultivation, the Huang He frequently overflows at various periods of the year.
Thus, Option C best explains why the population reached the highest level to increase.
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