There are people who do Arts and know for sure what they want to do, but a lot don't and are intending to either transfer through to something else (maybe law, maybe commerce, who knows), or complete it and then figure out the next move. Some though would know their intended major, then do teaching and teach around that major. Others may want to do criminology, work in criminal justice, others do lote, become linguists. Probably some do english/lit/writing intending to become an author.
For that other person, I'd say science over Arts. None of them really fit with arts, except perhaps teaching, however the other stuff is science/IT so you'd be teaching in that anyway, right? Probably best therefore to do science, can then probably narrow it down to sports science, switch to IT easier or transfer through to enginerring, maybe eventually doing a DipEd if thats what you want then.