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

A. have not vanished before 
B. have a habit of vanishing by default 
C. vanished faster a few years before
D. are not located on islands
E. and Sundarbans are two different issues
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সঠিক উত্তরঃ B. have a habit of vanishing by default 
Explanation: