Correct Answer: (a) Sundarbans National Park
Note: Among the given options, Sundarbans National Park
shares its border with Bangladesh. It is situated in
the delta of Ganga, Brahmaputra, and Meghna. Its
territory falls across India and Bangladesh.
Sundari trees (Heritiera fomes) are primarily found
in the Sundarbans, a mangrove forest delta formed
by the confluence of the Ganges, Brahmaputra and
Meghna Rivers in the Bay of Bengal spread across
Bangladesh and India.