I applied with semi-low grades, with a 3.9-4 weighted GPA, and my 2nd semester has kinda fallen down into a hole. I think I'm going to be getting 3Bs and a C, when previously I had an equal split of A's and B's. Would this be enough to rescind an acceptance? Would it be alright if I had an extenuating family circumstance? I am also aiming for pretty selective schools, low Ivies to NYU level of selectivity. Thanks in advance.