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".

Ex Input:
A black screen appears and the yellow words appear on them read "extreme how-to presents". The second black screen has yellow words that read "installing heated floor tile". a man <sep> (A) is now standing and talking in the corner of a residential home, dressed in a long sleeved button up black shirt, brown long pants, shoes and wearing a hat. (B) is installing the hardwood floors. (C) starts sweeping the floor in a position and putting gel between the tiles. (D) is shown attempting to installation tile in various rooms, including the top floor.

Ex Output:
A

Ex Input:
[header] How to introduce a pleco to a goldfish tank [title] Ask how large the pleco will grow to be. [step] Although most pet stores will sell plecos that are only a few inches in length, you should know that they can grow quite large. Fully grown plecos can reach up to two feet in length. <sep> (A) [title] Check your tank's surface before you place the pleco into the tank. [step] Make sure that your aquarium is opaque or has a drop-down tray so that your pleco is not exposed to water. (B) This can have a negative impact on their lifespan. [title] Choose a tank with large walls and no air holes. (C) [title] Make sure you cover more than twice the tank. [step] If you find that your pleco grows too much, cover the entire tank with a blanket. (D) The exact size of the pleco will vary depending on the species. Ask someone at the pet store how large the pleco will get before making a purchase.

Ex Output:
D

Ex Input:
[header] How to write a business process document [title] Gather a knowledgeable team. [step] At the beginning and throughout the process document creation process, you will need to work with a team relevant to the process you are outlining. Make sure to involve the people who carry out the process and their immediate superiors, as well as any upper-level management who need to approve changes to the process as you go. <sep> (A) Also make sure to focus more on streamlining your process process. [substeps] Ask questions you think the ball might roll in. (B) [substeps] If possible, reflect on each start-up period and the estimated amount of time its going to take for the process to get going. Typically it is about a week and a half. (C) Ideally, you will include as many managers, bosses, co-workers, and data officers as you have up front. Think carefully about anyone who has open access to the process document itself. (D) Try using meetings or informal focus groups with these people at the beginning when modeling the process. This will ensure that you don't miss any crucial steps or parts of the process.

Ex Output:
D