A. One of the odd-looking birds of the ocean is the penguin. B. _____________________. C. Penguins cannot fly.
Answer: B
Correct answer: It is found in the cold regions of the Antarctic Circle
A introduces the penguin and C states a fact about it, so B must be a further plain fact of the same kind, with it pointing back to the bird. The three options about flippers all begin with they or their, which has no plural antecedent yet, and they belong after C, which raises the subject of flight.
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