Reality check / common sense as your only realistic options are UCLA & UCal-Berkeley.
Consider this to be your first major business decision as an entrepreneur. U Penn-Wharton is not an affordable option. You would be burdening yourself with massive debt. Plus, as an Entrepreneurship major, you would have to delay that dream for about 10 years or more until you repaid your massive student loan debt from undergraduate school.
UCLA is a great university as is Cal. Plus, both are Big Ten schools !
Also, foolish to proceed directly from an undergraduate business degree to an MBA program. You will get more from an MBA program if you have at least 2 or 3 years of post-undergraduate degree full-time work experience. The top MBA programs like 3 to 5 years of post undergraduate work experience.