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 stay young [title] Challenge yourself to try new things. [step] Go out dancing, joining a book club or a hiking club, or try out for a community chorus. Singing, dancing, and finding new ways to stay active all contribute towards keeping a youthful outlook on life. <sep> (A) Here are some things to take into account : [substeps] Spend less time studying or practicing. Read only the books you are interested in, do not read video games, and do not browse old magazines or websites. (B) [substeps] Don't be afraid to laugh at yourself. Trying new things with joyfulness raises your levels of dopamine and energy levels. (C) [substeps] Try a fun game like punch or catch. Then, in the morning, you'll feel fresh and energized, and all your racing thoughts will be washed away. (D) If you can, challenge yourself to put in hours or weeks into each of these activities. Try hard but don't give up if you cannot help someone in need.

Ex Output:
B

Ex Input:
[header] How to wear rings [title] Use a ring-sizer to find the appropriate size for a ring. [step] Ring-sizers are plastic sheets with a variety of different sizes on them, which you can slide your finger into to find an appropriate fit. These are available at every jewelry counter for sizing rings. <sep> (A) [substeps] Your ring should fit your finger comfortably. It needs to be snug enough so that it stays on, but loose enough to slide off at the knuckle. (B) Use your ring-sizer to find a size that fits your finger size-which sounds easy. [substeps] A ring size 14-inch (27.6 cm) is approximately the ideal size, though it can add a mature look to a ring. (C) Many rings, especially those with 3 or more sizes, will fit comfortably onto your ring. [substeps] You can also do this freehand by simply finding a ring-sizer with a similar size. (D) When one is worn, do not buy one with rounded sides. This is likely to break or splinter, and it will probably have uva, bva, and uvb features of the ring.

Ex Output:
A

Ex Input:
[header] How to establish a curfew with your child [title] Decide on an appropriate curfew. [step] This should take into account when your child gets sleepy, age, and how long they typically nap during the day. Younger children need more sleep than older children or adults, but each child will vary in how much sleep is needed and you need to take this into account when making your decision. <sep> (A) [substeps] Many teens need eight hours of sleep per night, depending on the age group. Some may not need 10, but consider adding it if you are trying to establish a curfew of 12 hours. (B) [substeps] Typically, children need a minimum of eight hours of sleep per night. The more hours your child gets, the more sleep they'll need each night. (C) [substeps] If you have a sleep schedule and don't know how much time you have before bedtime, you might have to track the time. If your child is actually getting sleepy, you'll need to adjust your schedule. (D) [substeps] This step should not involve your child. [title] Tell your child about the curfew.

Ex Output:
D