Question: ..or can i retake that class online and have it replace my C?
Answer: I'd say your chances are probably very slim with the two C's. Even with straight A's it can be very slim. You really have to show them that you stand out in your essay and you are worthy of being a student there.
Others:
dude r you serious? no offense but yale is VERY hard to get into you can have straigth As and not get it. You probably wont get in (noffence, its relality) unlesss your family is rich and donated alot of money to yale or if you have somekind of legacy.