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One can infer from the reading that -

A. dolphins are quite abundant in some areas of the world

B. dolphins have skills that no other living creatures have, such as the ability to think

C. it is not usual for dolphins to communicate with each other

D. dolphins have some social traits that are similar to those of humans

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সঠিক উত্তরঃ D. dolphins have some social traits that are similar to those of humans

Explanation: