How bad will a C look to Phi Theta Kappa?

I've been going to a community college for three semesters now, I'm getting an ociate in science there. Before this semester I only had one B, the rest were A's. But this semester I got a C in trig, while my other cles were A's. My ulative GPA went from 3.9 to around 3.8, with this semester being a 3.6 by itself. I always thought that PTK was a science/math focused program (correct me if I'm wrong), so will a C in a math cl effect my chances of being invited after this semester? I mean I would hope it wouldn't, because of my other grades, but I'm not sure.They've sent me invitations after the other two semesters, and its not late enough for me to be expecting a third invitation yet. I just now started seriously considering joining them.