Rearrange that following sentences to make a meaningful paragraph:

A. More than a million coastal resident have already migrated North.
B. The Sundarbans spans nearly 4000 square mil of India and Bangladesh along the Bay of Bengal.
C. For the 7.5 million people who live in the region the first is a natural barrier against tides and cyclones.
D. The world's largest continuos Mangrove forest, it's how to a wide variety of species.
E. But as people cut trees and rising seas saline waters, the forest and the land itself are shrinking.

Choose the correct option: