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To find Kim Hyung Gyoon "s office in Samsung"s R&D complex, just follow the baskets of dirty clothes. No, Kim is not running the company laundry. As chief of Samsung"s Washing & Cleaning Technology Group (WCTG) , he"s the man behind a new washing machine that deposits tiny silver particles (small pieces of things) -about 1110, 000 the thickness of a human hair-onto clothes to make them germ-and-odor-free without the need for hot water. The device represents the first mass-produced application of this type of nanotechnology-the science of very small struc- tures-to home appliances. "In summer of 2002, I asked everyone in the office to take off their socks, " says Kim. "I took one sock from each person and placed it in a regular washing machine;the others were washed in a machine with the Ag+ Nano System. The next day, I asked everyone to check the odor of their socks after a day"s wear. One began to produce a strong unpleasant smell, and the other was odorless. "
Kim says he came up with the idea five years ago while on a business trip to Japan, where he learned of a brand of socks that retained their freshness even after many days of unwashed wear and tear. Tiny sticks of silver with germ-killing chemicals were woven into the fabric. When he got back to Seoul, Kim applied the principle to washing machines.
According to the Korea Testing & Research Institute for the Chemical Industry, Samsung"s de- vice kills 99.9% of germs. Kim says garments stay germ-free for up to a month after being laun-dered. The Ag+ Nano device went on sale in March 2003 and costs around $1,150; the revolu- tionary technology is also being used in Samsung"s refrigerators and air conditioners.
No wonder: consumers seem to like a little silver in their spin cycles. Since Samsung"s nano-armed products were first launched, they have brought in an estimated $779 million in revenue. O-verall, nanotech has been one of science"s fastest-growing fields in recent years, with potential ap-plications in fields as diverse as energy production and toothpaste manufacture. The nanotech mar-ket is projected to be worth $1 trillion by 2015.
56. Which of the following best describes the nature of Kim Hyung Gyoon"s work？
[ A] Product development,
[ B] Market investigation.
[ C] Research designing.
[ D] Sales promotion.请帮忙给出正确答案和分析，谢谢！