Write the next sentence in the following story.

A cat pulls a dog on a leash. The dog follows the cat pulling it on the leash. the cat

OPT:
(i). pulls the dog up stairs on the leash.;
(ii). stands on the mouth of the leash while a man ties it's mouth with a piece of tape.;
(iii). sits next to a small white christmas tree.;
(iv). stops right in front of a brick wall.;. The answer should be
(i).