TASK DEFINITION: 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". 
PROBLEM: [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.

SOLUTION: D

PROBLEM: A far away shot of the crowd and people down on the floor where they were playing foosball. Text appears on the screen over the crowd. people <sep> (A) cheer as more text appears. (B) are celebrating as a group of women play shuffleboard. (C) are standing by the audience watching a game of foosball. (D) do flips and tumbles in a large circle in a bowling alley floor.

SOLUTION: A

PROBLEM: [header] How to get potassium nitrate [title] Make your way to a local drugstore or pharmacy. [step] You'll have the most luck finding potassium nitrate supplements at a store that specializes in body building supplements, like gnc. Potassium nitrate is sometimes used for athlete enhancement. <sep> (A) [title] Pay attention to the color of your urine. [step] If you have a pale urine, have a cloudy urine, or experience frequent vaginal urination, potassium nitrate is a good substitute. (B) [title] Locate the supplements section if you've gone to a pharmacy. [step] If you're in a pharmacy or drugstore, go to the supplements section and look for a potassium nitrate supplement. (C) It works mostly on food and is not difficult to get. [title] Open a package of your potassium nitrate. (D) [title] Don't confuse potassium nitrate with a regular natural substance. [step] Potassium nitrate is found in many products.

SOLUTION:
B