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". 

A woman is shown leaning against a wall. Several ballerinas are shown in a room. different techniques <sep> (A) are demonstrated by them. (B) are shown for performance. (C) are shown for ballroom dancing. (D) are shown to teach the groups how to dance.
A

[header] How to put music on facebook [title] Navigate to the website that features the music you want shared. [step] Examples of such websites are youtube and soundcloud. [title] Click on the " share " button located next to the music selection you want shared. <sep> (A) [step] You will be redirected to a page explaining to you exactly what music you want shared, and the category where it can be shared. [title] Click on " share " located below " share " in the drop-down menu. (B) [step] If you have multiple fans or listeners, you may see a link in the sidebar that says, " add a facebook friend to your friends list ". Click it if you want to add a facebook friend in the list. (C) [title] Scroll down until you see the right size. [step] If you are looking for music that is already on facebook, such as songs from a specific artist and/or a series of popular music videos, you will see the appropriate size. (D) [title] Select the option for facebook when asked how you want to share your selection. [title] Enter your facebook login information at the prompt.
D

[header] How to teach your older dog basic commands [title] Use positive reinforcement. [step] Your older dog will be more motivated to continue learning new commands throughout its life, if you use a positive rewards-based method. Training with verbal or physical punishment can scare your dog and make training sessions less fun. <sep> (A) Instead, practice based rewards like putting the treats back in your dog's mouth or giving positive verbal cues like " good job! " or " well done! " praising your dog makes training even more fun. [substeps] Reinforcement training may be more suited to younger dogs than short bursts of positive reinforcement. (B) Instead, use positive reinforcement at the beginning of training with play and verbal praise. [substeps] For example, say' happy new week'. (C) You can teach a variety of basic commands, such as " sit ", " down ", " stay ", and " come " to an older dog by using positive reinforcement. [substeps] For example, teach your dog to " sit " by holding a treat in your hand in front of the dog. (D) [substeps] Verbal and physical punishment may be misconstrued as verbal punishment, while physical punishment can be interpreted as verbal praise, such as petting or a really big smile. Other positive reinforcement techniques include giving your dog treats after it chews, rewards, and giving verbal praise to your dog after training.

C