Explanation:

The Brahmaputra River, after entering Bangladesh from India, is known as the Jamuna River. This is a well-established geographical fact. Therefore, option D is correct. Option A, Tsangpo, is the name of the Brahmaputra River in Tibet before it enters India. Option B, Padma, is the name given to the main distributary of the Ganges River in Bangladesh. Option C, Dihang (or Siang), is one of the names of the Brahmaputra in Arunachal Pradesh, India. Thus, A, B, and C are incorrect names for the Brahmaputra in Bangladesh.