Given the task definition and input, reply with output. 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".

They move their canoes into the water and they begin to paddle in the water. They move their paddles from side to side and they enjoy the mellow day on the water. once they <sep> (A) have got all of their canoes up and are in position in the water, they begin paddling backwards in the water. (B) are out of wind, they begin to water ski in the river. (C) are done they come back to shore and go to have some drinks. (D) are done with their sit ups they go over and check on them and compliment them on their trophies from the competition.
C