I have been preparing (in India) for a competition exam for a few months. I was solving a book but got something which didn't make any sense to me. I have written a sentence below and we need to find the error in the sentence. The error I found it shows wrong and the answer it shows it's not making sense to me. I have mentioned the answer as well after the sentence.
Children enjoy listening to (A) ghosts stories (B) especially on Halloween night (C) No error (D)
The book says answer is "Children enjoy listening to (A)".