Limit of ln(x+1) as x->infinity

Hi, I'm a bit rusty on my math since it is summer...

but i have to do this summer assignment.

The original question is which of the following functions has a horizontal asymptote at y=-1? and it lists like 5 equations, one which is y=ln(x+1)

I'm thinking that you have to find the limit as x->infinity and negative infinity, and if the answer is -1, that is my equation. If that's wrong, point it out please.

And no graphing calculator, and i really don't want to hand draw these graphs (i have to show work)

Thanks!