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". 

Example Input: [header] How to feed a warm season lawn [title] Take a soil sample of your lawn. [step] A soil sample will give you an evaluation of the nutrients and determine what amendments or fertilizers will work best for your lawn. To take a sample, use a gardening spade and dig 5 holes that are 6-8 inches (15-20 cm) deep in several areas of your lawn. <sep> (A) [substeps] Avoid digging any deeper than the hole you are taking your soil sample from. Digging 4 holes too deep, or too small, could cut off the nutrients your soil provides for its root system, which could cause your grass to die. (B) Put the soil that you unearthed in a clear container and send it to your nearest cooperative extension. [substeps] You can take samples of your soil annually to keep up with the changes in nutrient content. (C) If the holes are shallow, use a flashlight or electronic device to locate the depth on the soil. [substeps] You can purchase soil samples at most major gardening and home improvement stores. (D) [substeps] Be careful, as you could trip on a garden hose and injure yourself. You can disinfect the soil during use by using two or three levels of bleach to dissolve it, then repump if necessary.
Example Output: B

Example Input: [header] How to clean a cast iron stove [title] Place an old newspaper on the ground in front of the stove. [step] Do this as a protective measure before you begin scooping ashes out of the stove, as they are liable to drop onto the ground. A newspaper will make cleanup much easier. <sep> (A) [substeps] You might even want to splash some cold water over the newspaper, so the water completely freezes around the newspaper. A drop of lemon juice can also help. (B) [title] Pour about a tablespoon of salt into the newspaper you have saved. [step] Add lemon juice and shake off the salt. (C) [title] Use the newspaper to wipe and scrape any soot out of the cast iron burner. [step] Do this several times until any soot is gone. (D) As you're spreading the newspaper, open the air dampener so that any ash stuck to it will fall into the firebox. [substeps] The air dampener will be a small knob on the front of the cast iron stove, that you should pull outward to open.
Example Output: D

Example Input: [header] How to install an egress window [title] Find out how large your egress window needs to be. [step] Requirements vary based on where you live, so look up local codes on the subject. It will likely need to be about 6 square feet (1.8 meters), and the bottom of the window opening will need to be no more than 44 inches (1.1 meters) off the floor. <sep> (A) [title] Consider a window that cannot be accessed from the outside. [step] An indoor window is much safer than a window that cannot be accessed with wire or a hose, and will usually be held by window guards. (B) [substeps] If you own a garage, the next step is to check for any obvious obstructions, including crushed concrete. [title] Order an egress window from your local hardware store. (C) [title] Measure and mark your cut on the inside wall of your basement with a grease pencil. [title] Build a temporary support frame inside the basement. (D) [title] Use an arm hook for further control. [step] This arm hook is far more powerful than a bat hook, as it will be attached to the wall when you open the window, and moves fast.
Example Output:
C