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: A small group of people are seen lifting a large object into the back of a van and close ups of them and a building. The people are seen riding around a large gymnasium on roller blades performing various flips and tricks. the boys <sep> (A) continue skating around and interacting with one another and performing impressive tricks. (B) continue riding around a sports stadium and performing tricks. (C) play the drums while riding around on bouncy chairs that run in a tight group. (D) ride around again in the end with more people watching on the side.
Example Output: A

Example Input: [header] How to start a taxi company [title] Investigate whether there's a need for a taxi company in your area. [step] In smaller towns, the demand for taxis usually isn't so high, so considering a different location to start a taxi company might be a wise choice. [title] Determine your niche. <sep> (A) [step] What is the ideal type of taxi company or whether the need is a strong job market. However, there's also a reason you could (and probably should) start a taxi company for a fee. (B) [step] Taxi companies and vegans have a pressing concern in their treatment for foreigners in countries. Decide what you wish to be used for based on your niche and behaviors when applying for a taxi company. (C) [step] Though most taxi companies cater to all types of customers, there are those that cater to high-end clientele such as politicians, diplomats, and executives. Other taxi companies offer adapted vehicles for the physically impaired, while yet others provide green taxis for environmentally-conscious customers. (D) [step] To start a taxi company, you will first need to determine your own niche, and how much money you're willing to spend on the service. This is where you'll be able to make the hiring process go more smoothly.
Example Output: C

Example Input: [header] How to play tennis [title] Find a place to play. [step] You can play tennis at your local park, a gym, or a tennis club. Search online or ask friends where the best local courts are. <sep> (A) Alternatively, travel to the local library or look online to see if there are any at community centers that you can visit. [substeps] Playing tennis in a " fancy " or fancy neighborhood can save money on your annual bills, giving you financial bargaining power. (B) The location will depend on the type of sports match or tournament you play. When looking for a district and location, try to find a place with schools far enough away from home. (C) There are also a variety of things that can be played at local parks, so choose wisely and visit them regularly to find the best ones. [substeps] Playing in an open space will make your day go by faster, even if you know where the court is, and will also make you a more environmentally friendly environment. (D) Most parks let you play for free, but you'll probably need to pay membership fees to play anywhere else. [substeps] You can practice basic serving techniques in any large, open space, but it's best to spend as much time as possible on actual courts.
Example Output:
D