阅读短文，根据短文内容，从所给选项中选出能填入空白处的最佳选项，然后完成下题。
In the new century, "smart clothes” are used not only for covering your body, but for many other kinds of uses.   A German clothing maker has invented the “MP3 blue jacket”.This kind of jacket can be used as both an MP3 player and mobile phone.An English company has developed a cloth keyboard that can be put onto your pants.  If it gets dirty, the keyboard can be washed.As the technology improves, smart clothes will get much smarter.Researchers are developing clothes that can show your body temperature and heat you up before you feel cold. They can tell the doctor when you are in danger.This technology can also provide important information about your environment.      Jackets with GPS can keep you from getting lost.Probably smart clothes will one day be common in your own home.

A.Shirts can warn you of high pollution levels. B.Some kinds of smart clothes have come into the market. C.You can control your computer with it easily anywhere. D.Other smart clothes are special medical ones.

What is the best title of the passage?

A．Smart Clothes in the Market

B．Smart Clothes in New Century

C．Smart Clothes on your Streets

D．Smart Clothes with Keyboard