instruction:
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". 
question:
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.
answer:
A


question:
[header] How to solo travel to vienna [title] Plan to stay in a hostel. [step] When traveling alone, it's always a good idea to stay at a hostel. Not only are hostels generally cheaper than hotels, this will help you meet people during your travels. <sep> (A) Taking advantage of free accommodations can help you pass the time and save money. [title] Plan initial backpackers getting used to the cities and customs of vienna on the flat travelling budget. (B) While there are many events you may enjoy alone, vienna has a booming nightlife. On occasion, you may want company for a night out, so a hostel is a good option for this. (C) It will also offer a safe, modern way to escape from the nightlife. An hostel is also a good place to set your budget on a day-to-day basis as you decide if you want to stay alone. (D) Search online for hostels near you if you want to take a trip somewhere you've never been, and plan to stick to the hostel's offerings. [substeps] The best traveling companions who are available in these places will be people who seem friendly, adventurous, and easily reunited from their long life.
answer:
B


question:
[header] How to make a holographic illusion pyramid [title] Gather your materials. [step] Most of the items you'll need will be laying around the house. For instance, you probably have some old cd cases around. <sep> (A) [substeps] If you don't have any cds, don't bother making all of the pieces. Instead, have your parents make the pieces. (B) If you don't have any old cd cases lying around, you could build your own. You can build some elaborate pyramids from cardboard blocks, but you need some big enough to sit on. (C) You'll also need tape or glue, graph paper, a pen, a ruler and a smartphone. [title] Map out the dimensions of the template on the graph paper. (D) If that's the case you want, there's no shame in having more! [title] Open the case and locate the hologram projector. [step] You can find it in a big metal locker in a convenience store.
answer:

C