What is the main result of a dense tributary network in Himalayan rivers?

Correct answer: Increase in water and sediment supply to the main river

A tributary network is the pattern formed by the smaller streams and rivers that join a main river. In the Himalayan region, many tributaries originate in mountains, valleys, glaciers, or areas receiving heavy rainfall. When they join the main river, they add water and usually bring eroded sediment as well. The main river therefore develops a larger discharge and carries material that may later be deposited in plains, floodplains, or deltas. A dense network also enlarges the drainage basin served by the river.

Option A is correct because it identifies the main direct result: greater supply of water and sediment to the main channel. A tributary does not make the main river flow backward from the sea, remove all its water, or turn it into a volcano. The idea of a drainage basin is also useful: it is the area drained by the main river and its tributaries. Thus, a dense tributary network usually means a well-connected and substantial river system.