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".

Example Input: They are traveling to the event together and check into a hotel. The entire team spends time together before the event. two of the team members <sep> (A) are quick to start and begin to fence. (B) play volley ball with the team mates. (C) talk about their experience with the water polo event. (D) are dressed in some sort of uniform and they run on the stage and join the march.
Example Output: C

Example Input: People are standing in a swimming pool. they <sep> (A) are playing a game of water polo. (B) put on protective caps to ward off the cold. (C) dip a sponge into the water. (D) push themselves through a hole in the water.
Example Output: A

Example Input: [header] How to choose and install a doggie door [title] Consider door mounts. [step] Door mounts are doggie doors that are installed onto doors in your home. These can be placed on exterior doors to allow your dog to easily travel inside or outside. <sep> (A) The corral-style mounts tend to have fewer features as they are easily discussed in a later step. The main feature is having a door mount on your door. (B) [substeps] If your dog has sensitive ears, a door mount might be necessary if you plan to use a doggie door at night. If your dog will be outside overnight, they will need access to inside animals' homes at all times. (C) They can also by placed on internal doors, to allow your dog to access certain rooms in your home. Door mounts can be added to wooden, aluminum, or screen doors and typically consist of a swinging flap door. (D) You can also install screen or plastic panels on a front or rear door for a doggie door stand. There are window mounts that provide your dog with better ventilation, enhancing your doggie door.
Example Output:
C