The correct answer is option 'C' - The Brahmaputra System.

The Brahmaputra River is one of the major rivers in Asia and is characterized by deep gorges, V-shaped valleys, and frequent course changes in its Himalayan reaches. Below are the key reasons why the Brahmaputra River system is characterized by these features:

1. Geographical Location:
The Brahmaputra River originates in the Angsi Glacier in the Himalayas and flows through the Tibetan Plateau, India, and Bangladesh. Its Himalayan reaches are characterized by steep slopes and high elevations, which contribute to the formation of deep gorges and V-shaped valleys.

2. Tectonic Activity:
The region through which the Brahmaputra River flows is seismically active due to the convergence of the Indian and Eurasian tectonic plates. This tectonic activity leads to the upliftment of the Himalayas and the formation of deep gorges. The river cuts through these gorges, creating a spectacular landscape.

3. Erosion and Weathering:
The Brahmaputra River and its tributaries experience high erosion rates due to the large volume of sediment carried by the river. The fast-flowing water and the presence of loose, easily erodible rocks in the Himalayas contribute to the formation of deep gorges. Over time, the erosive power of the river shapes V-shaped valleys.

4. Glacial Influence:
The Brahmaputra River is fed by numerous glaciers in the Himalayas. The melting of these glaciers during the summer months results in increased water flow, leading to the river changing its course frequently. The river often meanders through the valleys, creating a dynamic and ever-changing landscape.

Overall, the Brahmaputra River system is characterized by deep gorges, V-shaped valleys, and frequent course changes due to its geographical location, tectonic activity, erosion and weathering processes, and glacial influence. These features make the Brahmaputra River an important natural resource and contribute to the diverse and unique ecosystem of the region.

The river system characterized by deep gorges, V-shaped valleys, and frequent course changes in its Himalayan reaches is the Brahmaputra System. The Brahmaputra river, originating in Tibet as the Tsangpo, carves out a deep gorge in the Central Himalayas near Namcha Barwa before entering India. This river system is known for its dynamic and turbulent course, which includes rapid changes in direction and the formation of gorges.