Correct option is A
The Naf River forms a natural border between Bangladesh and Myanmar. It flows from the Bay of Bengal and separates the two countries along their southeastern border.
Information Booster :
Naf: This river is approximately 120 kilometers long and is the correct answer for marking the boundary between Bangladesh and Myanmar.
Brahmaputra: This is one of the major rivers in the Indian subcontinent but does not form a boundary between Bangladesh and Myanmar. It flows through India, Bangladesh, and China.
Mekong: This river flows through Southeast Asia, passing through countries like China, Laos, Cambodia, and Vietnam but not Bangladesh or Myanmar.
Indus: The Indus River flows through northern India and Pakistan, and it does not form a border between Bangladesh and Myanmar.
Additional Information :
Naf River: It originates from the Bay of Bengal and forms part of the border between Cox’s Bazar in Bangladesh and the Rakhine State in Myanmar.