Getting a C in Math Analysis Junior Year

So I am most likely going to end up with a C in Math Analysis for my first semester of junior year. Will this heavily impact my chances of getting to a school like UCSB or any of the lower acceptance rate UC Schools? Does one C completely change the way admissions views an applicant? This will be the only C on my transcript, and I’ve only ever gotten A’s.

Any help would be much appreciated!

One C is probably not going to cause you application to immediately move to the rejection pile.