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 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.
[EX A]: D

[EX Q]: [header] How to install debian [title] Back up any important files on your computer. [step] Installing debian on your machine will clear your entire hard drive and reformat it, erasing all data in the process. Store your important information on a removable drive before beginning the installation. <sep> (A) [title] Navigate your web browser to the debian website. [step] Debian is distributed through www.debian. (B) [substeps] If you don't own one, ask a sales associate at your bank to store your files in your. Otherwise, you can install them on your own hard drive. (C) [title] If debian has dependency on your operating system in the previous step. [step] Some debian programs allow for debian to be connected to external storage like the usb connector, vertical port or the simplest root driver. (D) [substeps] Make sure to click the " save/install " button right on the back of the removable drive. [title] Locate and modify the " reason for installing debian " website.
[EX A]: A

[EX Q]: [header] How to convince your parents to take you to disney world [title] Understand your parents' situation. [step] Before you ask your parents about taking a family vacation to disney world, you need to think about their situation and how best to approach it. You need to think about a number of different factors, including how much money your parents make and what their schedules are like. <sep> (A) Understanding your family's resources will make it much easier to develop a strong case for going to disney world. [substeps] It would probably be awkward asking your parents how much money they make, so try to subtly ask them. (B) [title] Be prepared for your parents' objections. [step] A surprise visit from disney world will definitely dissuade your parents from wanting to go on the trip. (C) Talk with your parents to find out if they are willing to accept the trip or if they have somewhere else they'd prefer for their child to go. [substeps] It's best to start with conventional adults. (D) You also need to understand that some parents vacation only a few times a year. [substeps] Figure out where your parents spend money.
[EX A]:
A