The Brahmaputra, Irrawaddy and Mekong Rivers originate in Tibet's narrow and parallel mountain ranges in their upper reaches. Of these rivers, Brahmaputra makes a “U” turn in its course to flow into India. This “U” turn is due to

Correct Option: (B) Syntaxial bending of geologically young Himalayas

The Brahmaputra River originates in southwest Tibet, where it is known as the **Tsangpo River** (meaning "river from the crest or summit"). It flows eastward across southern Tibet, carving deep canyons through the Himalayan mountain ranges, and eventually enters Arunachal Pradesh, India. In Arunachal Pradesh, it is called the **Dihang**. As the river continues its journey southwest through the Assam Basin, it is known as the **Brahmaputra**. Upon entering Bangladesh, the river is called the **Jamuna** (not to be confused with the Yamuna River in India). The Brahmaputra takes a sharp **U-turn** in its course near **Namcha Barwa**, which is due to the **syntaxial bending** of the young geologically active Himalayan ranges. ### Additional Information: - The **syntaxial bends** are sharp, knee-like flexures observed at both the eastern and western extremities of the Himalayan ranges, where the mountains sharply curve southward. - On both ends of the Himalayas, the ranges appear to pivot around a focal point. In the west, this point is located south of the Pamir Knot, where the **Karakoram** meets the **Hindu Kush** mountains. - A similar hairpin bend is observed in the eastern Himalayas, particularly in Arunachal Pradesh, where the mountain range's direction changes abruptly from eastward to southward. These major syntaxial bends, along with several minor ones, are characteristic of the dynamic geology of the Himalayas.