I’m not exactly sure since I was business major from beginning.
Maybe political science or psychology? Those were majors that people I know switched to
after failing to get into school of business.
Everybody starts as Pre-Business major and then apply to business school usually around
sophomore year. I’m sure it works slighly different for transfer students, considering how there
are a lot of prerequisites to take, etc. I think you should email and ask some from
UCR SoBa (school of business administration) about switching to business.