The correct answer is: d) Brahmaputra Valley
The Brahmaputra Valley is the largest river valley in Assam. It is a fertile plain that is well-suited for agriculture. The valley is also home to a number of important rivers, including the Brahmaputra, the Barak, and the Dibang. These rivers provide water for irrigation and drinking, as well as transportation.
The Brahmaputra Valley is also home to a number of important industries, including tea, oil, and natural gas. The valley is a major economic hub for Assam and India.
The other options are incorrect because
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