Pissed off by my C

I got a 'C' for a socialogy class with Dr. Gold and I am kind pissed off about it. He says that our group presentation was poor, that I did not participate in class and that I perfomred mediocre on the exam.

What pisses me off is that he said one of our group members did not show up for the presentation. The guy did not show up for class! He only made it to two days and dropped out. How can you protect yourself from a student droping the class when they are in your group?

To make matters worse, Dr. G said that I got the highest mark out of my group which means they got penalized too and even worse.