I graduated with a Master's in Experimental psychology in 2020 with a C+ in research methods (core course and it actually counted even though other programs normally don't do that). Reason my grade was that low was because I finished a final project and final exam worth half of the class grade with severe dental pain from a dead tooth. At the time, accessible dental care was hours away. If I knew how incompletes for medical reasons worked, I would've just drove back and got a note from the dentist.
Finishing a Ph.D and got an A for their research methods equivalent when I took it there. Will employers care about the C+ if I apply for research positions (industry, post doc, etc.)? I understand that this concern is years after the fact, but I have heard of some instances where that matters to some.