you know what, I get a C+ in an 8 unit writing course during freshman year b/c of some problems at home. When asked about it during the interview, I told the interviewer why. They are human beings and understand. But, most of my other grades were A's and a couple of B's. See that is the thing, if you can maintain a really high GPA, then that one bad grade looks like a fluke or something and catches their eye and so they want to ask you about it. See, they ask you about to re-affirm their own guesses that something traumatizing must have happened to you that quarter, get it! So, just bust your ass and when asked why you got a C+ give a good response. See, if they are asking you why you got a C+ it is as if they are saying "well you got steller grades but you jacked up this quarter, what happened to you and how did you handle it"? So don't worry!! But re-take it and get an A. Believe me, it can me done.