The correct answer is option 4, Chemayungdung. The Brahmaputra River originates from the Chemayungdung glacier in the Kailash Range of southwestern Tibet. The glacier is located near Mount Kailash, which is considered a sacred mountain in Hinduism, Buddhism, and Jainism. The river then flows eastward through Tibet, cutting through the Himalayas and forming the Yarlung Tsangpo Grand Canyon, one of the deepest and longest canyons in the world. It then enters India, where it is known as the Brahmaputra River. The Brahmaputra River is an important waterway for transportation and a major source of water for irrigation in the region.