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". 

Ex Input:
[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.

Ex Output:
A


Ex Input:
[header] How to include spanking in child discipline [title] Find a private area. [step] Conducting this type of discipline in a private area preserves the dignity of your child and prevents unnecessary embarrassment. The focus should be on discipline and additional embarrassment for your child should be minimized. <sep> (A) [substeps] Look for a private area free of distractions. Have a book or other non-distracting object nearby to quiet the child and yourself. (B) [substeps] Most experts are adamant that children should never be spanked under any circumstances. Nonetheless, some parents believe that spanking is the best way to get children to adhere to rules. (C) [substeps] If you have permission to do so, choose a private area to discipline your child in private. It will help your child feel at home instead of surrounded by other adults. (D) There are a wide variety of private areas you can think about according to age and the individual or group of children that you're spanking. [substeps] Children should have close supervision at all times.

Ex Output:
B


Ex Input:
[header] How to remove rivets [title] Grind off as much of the rivet's head as possible with a grinder and grinding wheel. [step] Take care not to grind into the metal around the rivet. [title] Use a small punch and a hammer to drive the pin down part way through the rivet. <sep> (A) [title] Follow the alternative approach of grinding up just half the head. [step] Boiling your chip down gradually will allow the layers of rivet to come out readily, much like peeling off frozen ice cream. (B) [step] Note that this style of rivet does not have a hammer. [title] Scrape the rest of the rivet off using a tool like a knife. (C) [step] You may have to break it off more to slide it through. [title] Locate the pin inside the rivet to give your machine a tighter seal. (D) [step] This creates a starter hole that will help to guide the drill bit. [title] Select a drill bit a size smaller than the rivet.

Ex Output:

D