The Kosi River is infamous for frequent and destructive flooding in Bihar, which is why it is called the "Sorrow of Bihar".
A. Damodar – Incorrect. Known as the "Sorrow of Bengal" due to historical floods.
B. Gandak – Incorrect. Causes floods but not as devastating as Kosi.
C. Kosi – Correct. Known for its unpredictable course and floods in Bihar.
D. Sone – Incorrect. A relatively stable river with fewer flood issues.
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