I pick 2 ,And 4 is fine too

2 sounds almost like a rejection. 1 and 3 seem pretty much the same, with 3 being just a bit more embarrassment. I think I will go with 4, but I will probably regret that quickly.

I'd like all of them, really.

2 sounds more realistic and natural.

I think 2 is supposed to be her playing coy, which is nice, and it also fits with ZUN's description of her as mischievous and playful.