AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(A) Both A and R are true, and R is the correct explanation of A.
The Bhadu song from the Damodar valley confirms the river was called 'river of sorrow' because its frequent floods devastated life, property and agricultural activities in the region.
The source passage contains a Bhadu folk song from the Damodar valley that directly states the Damodar was "known as the river of sorrow" due to flooding troubles faced by people. Since the floods are precisely the reason it earned this title, R correctly explains A — making option (A) the right choice.