Read the sentence below to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Choose the option with that part as your answer. If there is no error, choose 'D' as your answer. (Ignore the errors of punctuation, if any).
An animal can be just as unhappy in a vast area or in a small one
An animal
can be just as unhappy in a vast area
or in a small one
No error.
Correct answer is C
as in a small one