What are my chances of having my LAC admission rescinded?

<p>I was accepted EDII to Mount Holyoke College and really want to go there, but I got a D in AP Calc this semester. I'm very nervous, but I was accepted after getting a C and B in precalc. (I blame the teacher- more than half of my class actually failed- but I know that doesn't really fly.) Is it likely that I'll get my decision rescinded? I am taking all honors and AP classes at one of the most selective schools in the country, our language and math departments just got a visit from the Chinese President... I really don't know how this will go over. Is there a way I can write the college explaining my situation? (I also missed a lot of school due to illness.)</p>