Why can the Brahmaputra channel be wide and braided in Assam?

Correct answer: Due to high water volume and heavy sediment load

The direct answer is A, due to high water volume and heavy sediment load. A braided river divides into several shifting channels separated by temporary or semi-permanent bars of sand, silt and gravel. The Brahmaputra in Assam can become wide and braided because it receives a large amount of water from heavy rainfall, snowmelt and many tributaries, while also carrying a heavy sediment load from the young, easily eroded Himalayan region. When a river has more sediment than one channel can carry, sediment is deposited as bars; the flowing water then splits around them into multiple channels. Option A is correct because it states both major causes: abundant water and abundant sediment. Option B is wrong because the Brahmaputra has many tributaries, not none. Option C is wrong because Assam is not a desert; it is a region of heavy monsoon rainfall and flood-prone plains. Option D is wrong because the Brahmaputra is a large surface river, not a completely underground river. The exact chain is: heavy rain and snowmelt provide water, tributaries add more flow, Himalayan erosion supplies sediment, deposition creates bars, and channels divide and rejoin. Remember “high water plus high silt can make braided channels.” A braided channel is not simply a river with many tributaries; its channels are multiple paths within the river bed itself.