What are the chances my application gets rescinded?

I was accepted to the CMU College of Science ED with. A-/B grades overall. However, I’m in danger of ending my second marking period with a C, two B-‘s and two high B’s/ low A-. What do you think the chance of CMU rescinding my application is?

Zero, although certainly try to get that C into the B range. Unless you get a D, get arrested, or be found to have lied in your application, you are unlikely to have your admissions rescinded.

Are you sure? Three of my grades are full letter grades below what they were the first marking period, and CMU is a pretty competitive school.