Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced. Reason R : Goats were more efficient at browsing than Abingdon tortoise. In the light of the above statements, choose the most appropriate answer from the options given below:

1. A. Both A and R are correct and R is the correct explanation of A
2. B. Both A and R are correct, but R is not the correct explanation of A
3. C. A is correct but R is not correct
4. D. A is not correct but R is correct

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