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".

[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.
B

[header] How to breed chihuahuas [title] Adopt a chihuahua to breed. [step] If you don't already have a chihuahua, you will need to get one that is ideal for breeding. Contact a breeder that specializes in breeding chihuahuas. <sep> (A) If you are looking to adopt a chihuahua you can breed, you should get it from a well-established and humane breeder that has solid documentation of its lineage. [substeps] Make sure your potential dog is in good physical and mental shape. (B) This is a good option for investors that want to go through a breed-specific final selection process before purchasing a dog from one of the breed-specific breeders. [substeps] Breed chihuahuas can learn complicated rules, including you will need to breed them yourself, or you may be able to substitute a dog from a previous relationship with one that is already bred. (C) Look around for a unique breed, preferably one that offers a wide variety of features. Remember to pay attention to age, as a young chihuahua is a rodent, and a healthy small baby chihuahua needs to be training and raised carefully. (D) Shop around a few different places before settling on one that is right for you. [substeps] Get a volunteer or mentor for this breed.
A

[header] How to flirt with your boyfriend [title] Close the door when you're getting ready for a date. [step] Putting a (temporary) barrier between the two of you bolsters his surprise and delight when you appear gorgeously dressed and smiling. [title] Surprise him. <sep> (A) [step] It's your job as the host to keep his attention and make his day. [substeps] Use a fantasy wand to represent him in his pajamas. (B) [step] Making sure you're available to share ideas is a three-way street. Since he has nothing but his feet to cover, get used to the idea of taking the initiative to surprise him up front in the evening when he gets home from work. (C) [step] It may be as simple as buying tickets to a movie he wants to see or a pint of his favorite ice cream. Little surprises along the way brighten his life and break up the usual routine. (D) [step] Leave the door open if he'll be front and center in the doorway; if you're standing somewhere else, lock the door. As soon as he comes by, take a quick look into his range of vision; then pull him in for a sensuous kiss.
C