Organisms And Populations

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason $\mathbf{R}$.

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: