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". 

Input: Consider Input: [header] How to dye your hair with coffee [title] Brew some coffee. [step] Brew about 1-2 cups (240-470 ml) of organic coffee. The coffee should be organic, because non-organic coffees usually have added chemicals and preservatives. <sep> (A) For best results, make your own coffee by just boiling water for at least 30 minutes before you dye. [substeps] It's important to pour the brewed coffee into a shaker and bring to a boil. (B) [title] Reserve the coffee, if you don't already. [step] Coffee typically comes with an anti-aging coffee stain, which means it defroshes much faster in the summer than it does in the winter. (C) It is important to serve the coffee as soon as possible to ensure that it takes at least 24 hours to brew. If the coffee is sitting in your refrigerator, turn it cold to speed up the process. (D) Be sure to use a dark roast coffee or espresso. This will help make sure your hair will darken with the coffee.

Output: D


Input: Consider 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.

Output: A


Input: Consider Input: [header] How to do research [title] Determine a good reason why this research needs to be done. [step] Clarify who it will help. The answer may be based on your academic, personal or professional needs, but it should be your motivation for doing a thorough job. <sep> (A) [substeps] Someone who finds your work to be fascinating will often work out a plan with you as a test partner. Workplace research should not be something you take lightly and be able to stand by. (B) [substeps] To determine whether a research effort is worthwhile, consider how successful your research is, how in-depth or if your research has an impact on the work that must be done in the future. Try to choose the person who will be doing the work that helps you achieve your goals. (C) [title] Define the problem or question at hand. [step] You should boil the question down to basic terms, time periods and disciplines. (D) [substeps] State whether you are engaged in this research. Any related sources will probably benefit or hinder your research.


Output: C