When given three pricing options, the majority of people will go for the middle one. I would personally make that an open-ended question, where you ask people to punch in a number. That would give more conclusive results. I'm willing to bet you're going to see most people pick the middle option, and unfortunately, that won't mean much.
> the majority of people will go for the middle one.
... of those who didn't leave because they didn't like any of them. And even that is not true. It's more of an urban legend popular between "UX designers." In reality, people will go with the cheapest option that fits their needs.