National university VS. Liberal arts colleges?

“But for business, trying to Masters, I should go to a university?” (#24)

It depends on which part of the sentence is emphasized.

“For business [as a major] . . . I should go to a university?”

Simply choose from any college or university that offers a business major.

"Trying to master’s [MBA], I should go to a university?

Relatively few students in highly regarded MBA programs have majored in business as an undergraduate. LAC students with various majors have long had success – probably even particular success – gaining admission to these programs.