Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** The Damodar River was historically known as the 'Sorrow of Bengal'. **Reason (R):** The river caused frequent and devastating floods in the plains of lower Bengal due to its steep gradient in the Chota Nagpur Plateau followed by a flat terrain in West Bengal. In the context of the above statements, which of the following is correct?

Options:

• A: Both A and R are true and R is the correct explanation of A.
• B: Both A and R are true but R is not the correct explanation of A.
• C: A is true but R is false.
• D: A is false but R is true.

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