This question is very open to interpretation, all guys have a different idea of what they consider each one of these choices to be. Some guys think kim kardashian is fat and that paris hilton was the right size and vice versa.
It would be easier to answer if you gave us example pictures to show what you meant by each, I think I would choose curvy but I have no idea what that looks like from your idea
I am often attracted to skinny girls the most it seems, however there are also curvy girls that I am attracted too as well. There are a rare amount of chubby girls I have ever been somewhat attracted to (ex: gorgeous faces, but muffin topping a bit too much.) I'm 99% certain I've never "liked" a fat girl. I've had a friend or two, and can have pleasant friendly conversation. That's it however, and if they start flirting I, immediately hit the eject button.