What happens next in this paragraph?

A person is seen swimming the depths of a pool floor. the man
Pick your answer from: (I) comes up before the camera, his face showing. (II) puts his arms around the swimmer standing beside him and the end ends with him swimming away. (III) uses a rag to wipe the pool deck down. (IV) enters and sits on the side pulling on a string while the camera captures his movements.
(I)