“Unfortunately, this came out to be a 2.0 “C” grade because of the grading scale (78-82%) was a “C.” I explained this in my essay”
You shouldn’t explain low grades in your personal essay. That belongs in the section at the end of the app for additional information. Your essay is the place for you to show colleges your voice as a writer and how you think. If your essay seemed too focused on making an excuse for a bad grade rather than showing what is interesting and unique about you, that may have hurt your chances.