Which river is known as the 'River of Sorrow' in Assam?

d River' because of its reddish color during floods. Option A (“Barak”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option B (“Subansiri”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Option D (“Lohit”) is incorrect because it does not match the river basin, lake type, location, tributary relationship, project or hydrological feature specified in the question. Therefore the correct option, index and explanation consistently identify Brahmaputra. The Brahmaputra River is often associated with floods and sorrow in Assam. However, technically the Brahmaputra is not specifically labeled 'River of Sorrow' but it is the main flood-causing river of Assam. The river is also called the 'Red River' because of its reddish color during floods.