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 stay up late without electronics [title] Drink caffeine. [step] Caffeine blocks neurotransmitters in your brain that make you sleepy. When you start to feel drowsy, reach for a cup of coffee or a soda. <sep> (A) Remember that caffeine loses its effectiveness with overuse. Try to save it for when you really need it. (B) Your body will start shutting down caffeine when you're outside and keep you awake by doing what it is meant to do. It can help you stay awake long enough to go to bed. (C) Though caffeine will not give you energy right before sleep, it will trigger the natural sleep signal that draws us into the world right before it hits. An caffeine-rich beverage will wake you up more, making your sleep better. (D) Coffee is the source of human sleepiness so drinking coffee or another caffeinated beverage before bedtime is important. Even an extra pill is a key lubricant.
Example Output: A

Example Input: There's a woman sitting on a cozy chair with her two cats next to her, knitting a black yarn hat. the black cat <sep> (A) wakes up from its sleep, goes over and rubs on the woman several times and one person in the back grabs his cat, drinks some water and finally goes back to sleep. (B) is now sitting on a silver plate, one paw quickly getting knitzed. (C) gives a series of pats on the brown and blue body, while the black cat tries to stand up. (D) is sitting right next to her and playing with the yarn while the brown cat is watching them.
Example Output: D

Example Input: [header] How to create depth of field in photoshop [title] Open your photoshop. [step] We will be using photoshop cs5, for you who don't have the latest version installed in your computer. [title] Choose your photo. <sep> (A) [step] The default size frame will usually be the size of a human face, but you can adjust it by moving the picture or drawing the entire image. [title] Place the picture to the frame at that 90 degree angle. (B) [step] You can choose between solid or bright colors. You may select one of the colors for the background and only use it on your cs5 background. (C) [step] We'll be using a variety of 3d shapes and colors in order to inject amazing depth. The widest view of our selection range is 400 x 600 cs5. (D) [step] Go to file] open (or just ctrl + o) then choose the desired photo from your folder. [title] Select the photo you wish to edit.
Example Output:
D