In a pile of reading material, there are novels, story-books, dramas and comics. Every novel has a drama next to it, every story-book has a comic next to it and there is no story-book next to novel. If there be a novel at the top and the number of books be 40, the order of the books in the pile is :

• A. nscd
• B. ndsc
• C. csdn
• D. dncs