Chances of having my acceptance rescinded at Santa Clara University?

Hi everyone. I’ve been accepted to my top choice (Santa Clara University). However, I currently have a C in AP Bio which is what I’m majoring in and while I do have a chance to bring it up, and I plan to, I’m curious to see if I’m worrying way too much. I spoke to an admissions counselor because I’m just a paranoid person and I’m worrying about having my acceptace revoked, but she told me that if I got anything lower than a B, my application would be up for consideration to potentially be rescinded. She said they like to see A’s and B’s and I understand that but a C seems a bit much to me. It could be because I’m majoring in it. What do you guys think? Should I be really concerned? I would love to hear from any Santa Clara Broncos who’ve lived through this experience.