I'm torn between the first two. Mainly because they don't have pony ears. When it comes to animal girls (and cat girls especially), the ears are to me the most important part in defining them as such.
But then they do have the tails, which muddles it a little. And they have the race-specific horns/wings, but considering those don't belong on ponies in the first place, that doesn't make them more pony girls to me.
I went with the first option after thinking about it. It's just the tails that says ponies and that's not quite enough for me.
For the list, I'm going with the closest being Cat Girl. Its above rainbow people because you added horns, wings and tails. Still, they don't have animal faces, they don't have fur, you even opted to remove their hooves. As i think i said before, they're less than Satyrs in... "anthronis"?