In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

People are strapping on these qloja machines to their feet. It takes a pretty long time to get them on and then they start to walk. they <sep> (A) are really excited and ready to get on the machine so they taken off like they were walking on their own machines. (B) don't bend down very far at all, they just get on them and bounce around. (C) build up a little speed and start kind of running in a line. (D) start to go in circles and then the machine starts to look very unstable, you know it hurts pretty much the whole time.
C