Step 1: Identify the origin of the Brahmaputra River.
The Brahmaputra River originates in the Angsi Glacier, located on the northern side of the Himalayas in Burang County of Tibet.
Step 2: Relate the origin to the given options.
The Chema Yung Dung (also transliterated as Chemayungdung) Glacier is often identified as the source of the Brahmaputra River, particularly in earlier geographical texts. While more recent findings point to the Angsi Glacier as the exact source, Chema Yung Dung remains a commonly accepted and cited origin point in many contexts, especially in general knowledge and competitive exams. Manasa Sarovar is a lake near the origin, but not the glacier itself. Dibang and Lohit are tributaries of the Brahmaputra, not its source glacier.
Step 3: Conclude the correct option.
Based on the common understanding and available options, the Chema Yung Dung Glacier is considered the birthplace of the Brahmaputra River among the given choices.