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[A] : Pila is adopted to lead an amphibi...

[A] : Pila is adopted to lead an amphibious life .
[R] : It is provided with a pulmonary sac for aerial respiration and a gill or ctenidium for aquatic respiration .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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