Business is so boring. I take it and I wish I could drop it. It's just filling in worksheets day in day out. I hate it and it bores me to death... no-one in my class likes it.
I take History and Geography and I'd say they go very well hand-in-hand. I have no experience with Computer Science, though. But honestly, History is the way to go! It's very interesting. Though don't stress yourself too badly - the options do not matter much (although it feels like they do!), only if they are soft or hard subjects (business is soft)... A-Levels are where it's important.
If you are terribly unhappy with your options, though, schools usually let you change subjects within the first half term... so you can always fall back on that!