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". 
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Question: [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.

Answer: D


Question: [header] How to paint watermelon nails [title] Remove any old nail polish. [step] Soak a cotton ball or pad with nail polish remover. Rub the soaked cotton ball over the old nail polish gently to remove the polish. <sep> (A) [substeps] Rinse away the polish from the peel and gently scrub away the residue, to avoid further staining the polish. You do not have to cover the peel in nail polish remover. (B) Don't wipe the wet cotton onto the watermelon, but rather gently rub it over the nail until the paint is lost. [substeps] Washing the cotton ball between uses will get rid of any old paint. (C) You can also wear gloves to avoid damaging your fingers. [substeps] The rubbing motion will help the polish to adhere to the nails. (D) [title] Paint your entire nail a light pink or red, the color of watermelons. [step] After applying a clear base coat apply a thin coat of pink or red polish starting at the base of the nail and working your way up.

Answer: D


Question: [header] How to enhance your dog's recall [title] Choose a friendly environment for training. [step] Your dog will learn best in an environment where it feels comfortable and stress free. If you try to train your dog's recall in an unfamiliar or stressful environment, your dog will have a hard time paying attention to your commands. <sep> (A) [substeps] Parks and outdoor spaces should be recommended. Consider choosing a park or outdoor area just for the dog's recall. (B) Take several things into consideration in regards to your dog's recall. [substeps] Your dog will learn better by focusing your attention on how it learns your commands. (C) [substeps] The best place to train your dog is in your own yard, since your dog is very familiar with this area and won't feel stressed out. If you don't have a yard, you can take your dog to a familiar park. (D) [substeps] For instance, if your dog is about to go to the bathroom, place your dog on the floor in front of you. Say " toilet " and use one hand to lift up dog's bottom thigh.

Answer:
C


