What is the correct reason for the Mahanadi delta being associated with the Odisha coast?

Correct answer: Mahanadi flows eastward and deposits sediment in the Bay of Bengal

The direct answer is C: Mahanadi flows eastward and deposits sediment in the Bay of Bengal. A delta forms near a river’s mouth when the river slows down and leaves behind sediment such as sand, silt and clay. The Mahanadi flows across central and eastern India toward the east coast, enters the Bay of Bengal and builds a delta along the Odisha coast. Option C is correct because it gives both the direction and the process that explain the delta. Option A is wrong because the Mahanadi does not flow westward into the Arabian Sea. Option B is wrong because it does not rise in Tibet or flow through Assam; those details are associated with Himalayan river systems, not the Mahanadi. Option D is wrong because the Mahanadi is not a northern tributary of the Ganga; it is an important east-flowing Peninsular river. The chain is: eastward flow, lower speed near the coast, sediment deposition, delta formation, Odisha coast. Memory cue: Mahanadi means Odisha, east coast, Bay of Bengal and delta.