Which element(s) is/are NOT characteristic of a gothic novel? Here are the elements:(i) Castles and graveyards(ii) No supernatural images(iii) A...

I think the one you're looking to eliminate from that list is "no supernatural images". Gothic novels tend to be packed full of images and figures of the supernatural, as well as with the supernatural itself.

Gothic novels - Shelley's "Frankenstein", or (that most famous of Gothic novels) Walpole's "The Castle of Otranto" are two good examples - are fascinated with the supernatural: ghosts, monsters, spirits, life after death.