Why don't you just call up your favorite schools and ask what they would have you do about it. It's true that some of the schools don't require it, so they'll let it slip when it comes to assessing you as a candidate, but you best get that information from the horses mouth.
Dawg OD and I both go to SCO and while he didn't get asked about his D, I definitely did get asked about some questionable trends in my grades. So just call them up and see what they want you to do, all of us have had separate and different experiences and I wouldn't want you to make such a decision based on what we say here.