Answer:
The only option that doesn't represent a job in Theatre for Sound is:
Sound Artists.
Step-by-step explanation:
The reasons behind this answer are: first of all foley artists are in charge o the production of special effects. Second, sound designers are artists that create soundtracks, sounds, and tracks to be used in very different environments including theatre. Third, Sound engineers are the ones that are in charge of the sound system on the technical side in theatre. However sound artists are a multidisciplinary discipline that most likely work isolated and don't participate in theatre.