How Much do Senior Grades Matter

I have received mostly A’s throughout my high school career with only one or two B’s per year (for a total of 4 so far), but I might get a few more than usual this year. I also applied to Penn ED and am expecting the decision in about a week. If I do get in to Penn, will it matter if I get a few more B’s than usual this year (second semester specifically)? It seems like rescinding someone’s admittance is a pretty aggressive and rare thing for a college to do, so I’m just wondering how much I would have to slack off for a school like Penn to rescind my acceptance after I’m admitted (if of course I end up getting in at all). All feedback is appreciated, thanks.

You will not have an admission rescinded for B’s.

what will they rescind for then? i had this question as well

A D or an F, although a string of Cs won’t be viewed too fondly. Also don’t get arrested and don’t have lied on your application.