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 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.
Example Output: A

Example Input: [header] How to use a vanilla bean [title] Split the pod if you want to use the seeds. [step] If you are planning to use the vanilla bean in a batter for a cake or for a batch of cookies, you will need to open the vanilla bean pod and remove the seeds. You will then add the seeds to the batter to infuse it with a natural vanilla flavor. <sep> (A) [substeps] [substeps] Wait a few minutes before parting the pod or moving it to a serving dish. Being too cold will crush the seeds as they break into the batter. (B) [substeps] Removing the seeds can make it easier to infuse the pod with a natural vanilla flavor. A good rule of thumb is to reserve about ½ cup (100 g) of pod before you can drink the rest. (C) [substeps] Keep in mind that you will not be able to extract the seeds directly from the pod if you plan to use it. Instead, you will be mixing the seeds into the flour. (D) [substeps] To split the pod, lay the vanilla bean pod on top of a clean, dry cutting board. Turn the hooked end of the vanilla bean to the top of the board.
Example Output: D

Example Input: [header] How to drive a van [title] Adjust your seat and mirrors. [step] Move your seat until you can reach the pedals comfortably while still seeing all your mirrors. Adjust your mirrors so that you can clearly view the adjacent roads and just a small amount of the van's edge. <sep> (A) If you have motion sickness, you may want to sit a bit farther back than you normally would while driving van. You'll want to do some preliminary maintenance to make sure that your vehicle's airspace is as quiet as possible. (B) Since they're designed to hold cargo, many vans do not include a rear-view mirror, making your side mirrors more important. [substeps] Some vans have extendable side mirrors designed for people carrying trailers. (C) [substeps] Make sure that the front fender area of your vehicle comes completely above the seat's height. Also, avoid tilting the front fender forward too much or the car will make a wide angled curve in your direction. (D) [substeps] If possible, make sure that you are facing forward in traffic. Try to angle it as an' inverted' " v " (not a " s ") to see which side of your seat will be more visible from your side mirror.
Example Output:
B