Mistake on app! Help?

<p>Hi guys,</p>

<p>I’m a prospective UC student who has recently been accepted to UCI and UCSD. As I read their condition of accept and went back to check on my application, I noticed that I had forgotten to input one of my grades from my Sophomore (10th grade) year! The class is Honors Biology with a grade of C. I have already emailed all the campuses regarding this matter but I am worried because this may jeopardize my admission especially after the decisions are out. How should I explain this to the schools and how much will this affect my admission status? Is it possible that they may let it slide/ don’t notice the difference?</p>