instruction:
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". 
question:
[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.
answer:
D


question:
[header] How to buy land in colorado [title] Figure out how much you can afford. [step] Start by using an online mortgage calculator to determine how much you can afford to spend. These calculators normally ask you to input your income and associated expenses (e.g. utilities, other loan payments, etc. <sep> (A) ) by the year in which you obtained the land, and how long you wait for payment. [substeps] Once you have figured out the amount, use that as a guideline. (B) ) in order to find the value of your property as a whole. Consider the following : [substeps] You cannot start with a simple down payment. (C) ), as well as the months that you were unable to make the payments. [substeps] Each time you make a mortgage, you will need to subtract the following from your net expenses: home equity interest, vacation pay, expenses for meals and healthcare (e.g. (D) ) and then will determine how much you can afford to spend on a monthly mortgage payment. These calculations also take into account interest rates, mortgage terms and amortization.
answer:
D


question:
[header] How to search for a duplicate article on wikihow [title] Go to wikihow. [title] Find the search bar on the top of the web page. [step] There are some drop-down boxes on the bar. <sep> (A) [title] Click the option with the picture that you want to format into the drop-down box on the right of the link. [title] Click the username of the web explorer that you want to copy the page to. (B) The search bar should be on the left. [title] Type in the keywords of an article you want to write. (C) [title] Click the " edit " button that indicates that the search bar is edited. [step] By default, this will save the copied article. (D) Click on the one labelled " search for a duplicate. " [title] Click the key for " fill " underneath the " create duplicate " box.
answer:

B