I was accepted ED, and generally my grades this semester will be good (6 a’s and a b or 7 a’s) but in one class, AP world history, I may get a b but it’s also pretty possible I’ll end up with a c. Would I be in danger of revoked admission?
No.
Actually it would be 5 a’s a b and a c or 6 a’s and a c
Still no. As long as you pass and commit no crimes, you will be fine. A D may be borderline. Of course your can avoid the anxiety by not getting a “c” 
Don’t give in to senioritis!!