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).
She sang very well. Isn't it?
She sang
very well
Isn't it?
No error.
Correct answer is C
Didn't she?