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". 

[Q]: [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.
[A]: D


[Q]: [header] How to train chickens to return to their coop [title] Prepare your chicken coop. [step] Before you can train your chickens to return to the coop in the evening, you need to ensure the coop is set up properly for your chickens. A basic chicken coop should provide at least twenty-four square feet of space and multiple places for chickens to perch. <sep> (A) To ensure proper lighting, you will need to buy a coop lamp or turn off the overhead light. You will also need to provide adequate heat. (B) Your chickens will probably also need a hutch, cart, or larder to keep them warm. All three features are important as you start building your chicken coop. (C) [substeps] Coop space should be compatible with how large or small your chickens may be. Don't space your chickens too close to each other. (D) [substeps] Make sure there is a plentiful supply of food and water inside the chicken coop. Wood beams mounted horizontally can provide good perching space for chickens.
[A]: D


[Q]: [header] How to care for hair between salon trips [title] Buy a deep conditioner. [step] You probably already have shampoo and conditioner. The conditioner you use regularly does condition your hair as thoroughly as a deep conditioner. <sep> (A) A deep conditioner will make your hair appear softer, shiner, and healthier. It should only be used once a week. (B) However, you're willing to risk starting your hair oily or looking like a buck without a deep conditioner. Look for a deep conditioner made specifically for you hair at your local salon. (C) But you don't want to purchase a deep conditioner as any hair at all. Invest in a deep conditioner and make sure you use it daily. (D) Choose a deep conditioner, spritz it on your hair, then shampoo, then blow dry. You can simply apply the deep conditioner once a day and then continue rinsing to replace it over time.
[A]:
A