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". 

[Q]: [header] How to visit the top 10 tourist destinations in london [title] If you are planning to visit london why not try visiting the following must-see places? [title] Visit the british museum at great russell street. The british museum's art collection includes artworks from all over the world. [step] The british museum houses the rosetta stone, sculptures from parthenon, and the portland vase. <sep> (A) Visit art galleries, amazing places, and places which you have never been. [substeps] Do not forget to ask for drivers from the london lights station, trinity quarter , 121 lights avenue-this is the only modern route to london. (B) The british museum is considered as one of the best in the world and it was established in 1753 via the act of parliament. The first collections were from sir hans sloane. (C) They are also accessible by either gps or facebook. [substeps] If you are going to the london museum, press the' get started' button. (D) Occasionally you may see art museums in london that serve as places to observe british history-like the australian museum. [title] Then take the ferry from oxford to mcdonald's, the capital city of london.
[A]: B


[Q]: [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.
[A]: A


[Q]: [header] How to straighten the back of your hair [title] Wash your hair. [step] If your hair is fine, you should choose a lightweight, volumizing shampoo and conditioner. After you leave the shower, a volumizing mousse with heat protection is an excellent choice to defend your hair from heat damage. <sep> (A) This hair product offers different damaging effects than heat styling products, so you'll want to choose a conditioner that's also hydrating to cut and maintain the hydration necessary for your hair's overall appearance. [substeps] Select products specifically for your hair type for best results. (B) [substeps] If you have very straight or wavy hair, a leave-in shampoo will save your hair the energy it needs to straighten. All you have to do is apply a large amount of mousse to the ends of your hair, since they tend to be frizzy most of the time. (C) If your hair is thick/coarse, choose a smoothing shampoo and conditioner. Though not absolutely necessary for straightening your hair, when you exit the shower, you should consider a smoothing serum with heat protection to keep your hair undamaged. (D) [substeps] Follow up with the french conditioner or flat shampoo. If your hair is currently damp, you may opt for water instead.
[A]:
C