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 make black coffee [title] Purchase freshly roasted, whole bean coffee. [step] If you can't purchase it directly from the roaster within a week or so of it being roasted, opt for a vacuum-sealed bag from a reputable national coffee-bean roaster. [title] Purchase your own coffee grinder, or grind it in the store. <sep> (A) [step] If possible, choose a burr grinder in place of a normal blade grinder. For best results, grind the coffee fresh right before brewing each day. (B) [step] Grind coffee beans in the near-black zone of a coffee grinder. You can use either a regular-size grinder or a pre-grind grinder to grind your coffee. (C) [step] Modern coffee grinders have drawbacks, as they require higher temperatures to make purified coffee. Where possible, purchase one that comes pre-boil. (D) [step] Print it onto a piece of paper, remove the lid from the coffee grinder, and grind the coffee beans in the machine's center. [title] Unplug the coffee grinder and plug it into the wall outlet.
answer:
A


question:
[header] How to avoid the stomach flu [title] Wash your hands often. [step] Wash your hands carefully with soap and water for at least 20 seconds. Always wash your hands after going to the washroom and before and after handling food and eating. <sep> (A) Washing your hands is important, since if the way you handle and eat is bad (germs, bacteria, etc. ), your best chance at preventing the flu is by keeping your hands clean. (B) Don't attempt to dry or clean your hands on something other than a business table. [title] Wear long pants (not utility pants to wear running shoes with). (C) [substeps] It's a good idea to wash your hands between-and as many times as you go to the bathroom. This will help prevent an episode of nausea in the future, as well as allow your body time to shut down its internal defenses to fight off food, germs, and viruses. (D) This will help to prevent the spread of germs. Germs on your hands can get into your eyes, ears, and nose and make you sick.
answer:
D


question:
[header] How to make marshmallow muffins [title] Sieve the self-raising flour into a medium bowl. [step] Keep the sieve high above the bowl (but not too high) so air can get into the flour. The more air in your flour, the lighter the muffins will be. <sep> (A) You'll be able to add an additional handful of seed if the muffins are too dry. [substeps] You can use olive oil or canola oil if you don't have an electric sieve. (B) Dense muffins do not taste very nice. [title] Add the softened butter or margarine to the bowl. (C) [substeps] You can also use a thermometer to check the temperature. You can buy a thermometer at a supermarket or a bakery that sells baking supplies. (D) [title] Place the mixture into a pastry or lightly greased muffin pan. [step] If you like your muffin muffins either cold or hot, choose a pan that is big enough to expand.
answer:

B