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).
The retiring principal asked his old pupils to take the interest in the school after he has retired.
The retiring principal asked his old pupils
to take the interest in the school
after he has retired.
No error.
Correct answer is B
to take interest in his school