Which of the following plants are commonly found in Sunderban Biosphere Reserve?

The correct option is C Mangroves

Sunderban has achieved its name from sunderi tree. It is the most exquisite variety of tree that is found in this area, a special kind of Mangrove tree. It has specialized roots called pneumatophore which emerge above ground and help in gaseous exchange i.e. respiration.

So, the correct answer is "Mangroves".