This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to buy a xiaomi phone
Buy a xiaomi from a store in china.
This is the easiest way to purchase a xiaomi smartphone as all the models are available and the phone is optimized for chinese use and networks. Also, the first release of new models will be in china, xiaomi's home market.

Options are:
A). Decide how the phone you use will occupy your everyday life. Do you need a mobile phone, a laptop, or a tablet? A phone that you use is best for your lifestyle and day-to-day living--i.e..
B). Since you're buying a xiaomi phone, you'll have to know how to use this phone but ensure that the prices aren't too much for your convenience. Read reviews of china before you buy your phone..
C). Visit a official retailer in any major city like china telecom or china unicom and see what phones they have for sale. Note that if you want to use your phone while travelling abroad, you should buy the china telecom or china unicom model..
D). These models were set up in single brick. Most of the irons used are similar to xiaomi or xiaomi designs, though if the others are slightly different, the phenom is longer in length..
The answer is:
C).