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 clean a plastic water tank [title] Open the outlet valve or tap. [step] The first step to cleaning your tank is to empty all of the water from it. To do so, open the outlet valve or tap at the bottom of your tank and let all of the water flow out. <sep> (A) [substeps] You may find that there's extra water in your tank that you need to empty. Read the instructions carefully to see if your water is full enough to remove. (B) You will have to remove several pieces of tank flooring to access one. For the best results, take the steps above. (C) Then, use a bucket to wipe the water down away from the water line, then gently empty the tank contents into the toilet. [substeps] You should also clean the water tank once every few months to keep it clean. (D) [substeps] Connect a hose to the open valve in order to direct the water to a location where it will not cause any localized flooding or erosion. Permanent water tanks have a washout valve that is located at the base of the tank.
[A]: D


[Q]: [header] How to unblock a toilet when you have no plunger [title] Cover the end of a mop with a plastic bag. [step] Pull the bag over the end of the mop. Then, tie it off or secure it in place with a rubber band. <sep> (A) You can also use a rag or a toilet cloth to help secure the bag if you don't have a mop. [substeps] Try using empty containers to provide more protection. (B) After securing the handle of the mop, throw it away. [title] Turn on the water faucet. (C) [substeps] Discard any waste that falls from the end of the mop. [title] Use the bucket or bowl to catch any urine that spills out. (D) [title] Plunge your toilet with the mop. [step] Use a forceful in and out motion like you would with a normal plunger.
[A]: D


[Q]: [header] How to cook oats upma [title] Heat a nonstick pan. [step] Place a large pan on the stove, and turn the heat to medium. Allow the pan to heat up for at least 3 minutes. <sep> (A) [title] Add the oats and roast them until crisp. [step] Once the pan is hot, place 1 cup (234 g) of instant oats inside. (B) [substeps] If you have a thermometer, set the temperature to 300 degrees fahrenheit (150 degrees celsius) and let it cook for 1 minute. [title] Place the oats in a shallow dish. (C) Ensure that your pan is kept at a low and medium temperature. [substeps] You can use a grill pan, a roasting pan, or a wax steamer. (D) [substeps] Check to see if the pan is nonstick. If the pan is nonstick, place a piece of aluminum foil over the pan.
[A]:
A