Definition: 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". 
Input: People are playing a polo match in a field. the focus <sep> (A) of the game is on leap from scissor springs. (B) is trained on a person in the corner. (C) is on one man and horse who chase the ball. (D) lights are spinning around.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
C