Correct Option: B

The Sundarbans is the largest single block of tidal halophytic mangrove forest in the world. The Sundarbans Mangroves eco-region on the coast forms the seaward fringe of the delta and is the world’s largest mangrove ecosystem, with 20,400 square kilometres. The dominant mangrove species Heritiera fomes is locally known as sundri or sundari. Mangrove forests are not home to a great variety of plants.