What is the primary reason for the exceptionally high natural fertility of the Khadar (New Alluvium) soil compared to the Bhangar (Old Alluvium) soil in North Bihar?

Options:

• A: It has a higher concentration of iron oxides and quartz.
• B: It is rich in calcium carbonate nodules called Kankar.
• C: It is annually replenished with fresh silt and organic nutrients by river floods.
• D: It has a neutral pH and low water-retaining capacity.

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