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 whitewash trim [title] Set up your working area. [step] Cover the floor with a drop cloth to keep dust and whitewash off of it. Open screened windows and doors to provide ventilation. <sep> (A) Keep the temperature low to avoid fumes and keep your work area clean. Additionally, have at least one sheet of newspaper in case a lightning storm or other electrical emergency strikes strikes your home. (B) Set all of your supplies in a corner of the room so you know where everything is. [substeps] If you don't have a lot of experience painting, use painter's tape to tape off areas you don't want to get whitewash, like the walls. (C) [title] Consider using a small piece of velcro, preferably one in a similar color, to lock in moisture in the paneling. [step] For smaller boards, make sure to allow at least 24 hours for the patch to dry between applications. (D) You may also want to swing curtains over them for a soft and light cleaning that will come before whitewashing. There are online projects to do, or you can perform laser removal yourself.

Ex Output:
B


Ex Input:
[header] How to read a screw thread callout [title] Read the numbers. [step] They will look something like one of these : [substeps] 4-40 x. 5 1/4-20 x 5/8 m3-0.50 x 10 [title] Interpret the first number. [step] The first number gives the major, or largest, diameter. <sep> (A) Next, determine the size of the screw thread you wish to use. Write these numbers down on several pieces of paper and trace around them. (B) It also tells you the larger diameter of a screw thread to create a series of polygons which share a small degree of overlap by a single number. [title] Separate the single digits in each string from each string. (C) [substeps] In unified threads (measured in inches) there are numbered diameters 0 through 10, with 0 the smallest and 10 the largest. ( diameters 12 and 14 may also be found, but are usually on older equipment and needed for repairs or restorations. (D) However, an " x " will bring more light up on an empty needle, so use a tray or ice scraper to fill it to feel the thickness of the screw. The next number tells us that the machine is a small amount bigger or larger than what we used it for.

Ex Output:
C


Ex Input:
[header] How to treat heart failure in dogs [title] Restrict the amount of exercise your dog gets each day. [step] When a dog has a weak heart, exercise can add extra pressure to his condition. Heart failure can lead to difficulty with blood circulation, meaning that your dog's vital organs do not get enough oxygen. <sep> (A) Limit how much exercise your dog gets each day. [substeps] For example, if you only take your dog for walks every day, it will be a good time to plan walks with your dog to tire it out and build it up again. (B) If your dog has heart failure, he should not be allowed to exercise heavily, though he can still wander around the yard. Forgo taking him on walks for peaceful hours petting him or letting him lounge. (C) If this becomes a problem for your dog, restrict the amount of activity your dog can do each day. [substeps] For example, if your dog weighs 50 pounds, try not to exercise this much each day. (D) Limit the amount of exercise your dog gets each day and avoid the following : [substeps] Walking. Your dog should walk around for several minutes every day.

Ex Output:

B