The Ganga river is known as the Padma river in Bangladesh. This is the correct answer. Option 2, Ganga, is the original name of the river in India. Option 3, Damodar, is a different river altogether and is not related to the Ganga. Option 4, Meghna, is another river in Bangladesh, but it is not the same as the Ganga or Padma. It is important to note that the Ganga river flows through both India and Bangladesh, and its name changes to Padma once it enters Bangladesh. This change in name is due to cultural and linguistic differences between the two countries.