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The  Sundarbans is known for vanishing islands but scientists said the current retreat of the mangrove forest on the shouthern coastling is not normal. It can be deduced from the excerpt that mangrove forests.

A. have not vanished  before 
B. have a habit or venishing by default 
C. banisshed faster few years before 
D. are not located on Islands 
E. and Sundarbans are to different issues 
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সঠিক উত্তরঃ B. have a habit or venishing by default 
Explanation: