I would say yes.
This is because of the name itself -- a "group" project. It's not a "solo" or an "alone" project. You are responsible for the other people's work in your group. It is important to make sure everyone contributes their own work in a group project, and not someone else's.
Best of luck
C because it sums up the whole passage
A, barely acknowledges their existence
The answer it the thesis. It explains what the entire essay will be about in one sentence.