You will be given a definition of a task first, then some input of the task.
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".

A small group of children are seen standing before a mat with an instructor helping. the girls <sep> (A) then begin throwing a rope to the back and covering the boys head with the rope. (B) then pole vault on the mat and swing during a routine. (C) do various gymnastics moves across the mats while an instructor assist them and another points to the side. (D) take turns running to the mat and pushing it down.
Output:
C