So, which of those will get me 100 g an hour?
I don't really have to even look at the list to say probably all of these will make that much. 100g in one hour isn't much at all. Especially considering you could go to the Argent Tournament and make 100g from the dailies there in like...30 minutes...maybe. If your goal is only 100g an hour, than just find one of those farming spots that you can do (i.e. not a skinning spot if you aren't a skinner) and that isn't highly contested and go to work.
Also, since every server varies, you should probably check your own Auction House for prices and then look over the list to see what you
think would do well on your
server. Making money does take a little bit of thought, you can't just come here and find the perfect answer. Obviously what works for one person may not work for another.
And if you decide you hate farming and you still only want to make 100g an hour, I highly recommend you just go do dailies. (Assuming you are level 80) They will be more exciting and make you at least 100g an hour.