Well, I do Legal studies and Modern History out of the above.
Legal studies is a lot of notes and rather boring, unless you really really crave going over the constitution, parliament and all that other crud you do in Aust. hist & commerce in years 9 & 10.
Modern is a lot of hard work but it is worth it, I think. (Yeah, I love modern.)
Although, if you are Artistically inclined, I suggest Ancient because alot of the things connect and overlap.
I can't speak for business studies. Sorry. And goodluck.