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 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.

A: A
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Q: [header] How to clean rubber boots [title] Wipe away light dirt and grime. [step] If your boots aren't especially dirty, you can usually clean them easily with a damp cloth. To prevent dirtiness from building up on your boots and causing longer cleaning times, do this after each time you use your boots. <sep> (A) Before handling an object or stepping on something wet, make sure you wipe it away on a rag first. Use a mild soap and water to wipe off even the smallest traces of dirt. (B) [substeps] To increase the dirt fighting potential of your damp cloth, mix 1 tsp (5 ml) of dish soap with a ¼ gallon (1 l) of water. Douse your rag in this, and wipe down the boots. (C) [title] Grind three pounds (177 g) of dry powder on a coffee grinder. [step] The dry powder will help to transfer dirt and dust to the boots. (D) This will clear little dirt and grime off of your boots, leaving them looking brand new. [substeps] If your boots are already cleaned, you may need to consult a shoe store or partner to inspect them for a better cleaner.

A: B
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Q: [header] How to be sensitive to other people's feelings [title] Pay attention to the person's face. [step] The face is the part of the body that is most likely to show emotions. If you're trying to determine whether someone is sad, upset, lonely or otherwise in pain, start by looking closely at the person's facial expression. <sep> (A) [substeps] Unlike some social cues, the seven basic facial expressions are said to be universal in expression across all cultures. These expressions are joy, surprise, contempt, anger, disgust, sadness, and fear. (B) It should be straightforward and minimal to interpret, but it should look genuinely concerned and sincere. [substeps] Consider the person's age and social status when determining how to affect their facial expressions. (C) [substeps] Since facial expressions often associated with sadness are often confused with feelings, scanning faces may help you find something more. Try to check where the emotion comes from. (D) If you feel like you're going to cry if you look at them, look out for the emotion they display. If they look upset, it may be of the emotional kind.

A:
A
****