The correct option is C 1-2-3
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Brahmaputra originates at Kailash Mansarovar, which is called tsangpo in Tibet.
Brahmaputra enters Bangladesh near Dhubri.It flows for a distance of 270 km in the name of Jamuna river and joins the Ganga .The united stream of the Jamuna and the Ganga flows further in the name of Padma.
About 105 km further downstream, the Padma is joined on the left bank by the Meghna,From the confluence of Padma and Meghna, the combined river is known as the Meghna which flows into the Bay of Bengal