Heathrow's move into "sensory" marketing is the latest in a long line of attempts by businesses to use sensory psychology—the scientific study of the effects of the senses on our behavior. to help sell products. Marketing people call this "atmosphere" using sounds or smells to manipulate consumer behavior. On Valentine's Day two years ago the chain of chemist's Super dog scented one of its London shops with chocolate. The smell of chocolate is supposed to have the effect of reducing concentration and making customers relax. "Chocolate is associated with love", said a marketing spokeswoman, "We thought it would get people in the mood for romance." She did not reveal, though, whether the smell actually made people spend more money.
However, research into customer satisfaction with certain scented products has clearly shown that smell does have a commercial effect, though of course it must be an appropriate smell②. In a survey, customers considered a lemon-scented detergent more effective than another scented with coconut despite the fact that the detergent used in both was identical. On the other hand, a coconut-scented suntan lotion was rated more effective than a lemon-scented one. A research group from Washington University reported that the smell of mint or orange sprayed in a store resulted in customers rating the store as more modem and more pleasant for shopping than other stores without the smell. Customers also rated the goods on sale as better, and expressed a stronger intention to visit the store again in the future.
Music too has long been used in supermarkets for marketing purposes. Supermarkets are aware, for example, that slow music causes customers to stay longer in the shop (and hopefully buy more things). At Leicester University psychologists have found that a specific kind of music can influence consumer behavior. In a supermarket French wine sold at the rate of 76% compared to 20% German wine when French accordion music was played. The same thing happened in reverse when German bierkeller music was played. In one American study people even bought more expensive wines when classical music was played instead of country music.
Writers and poets have often described the powerful effects of smell on our emotion, and smell is often considered to be the sense most likely to evoke emotion-filled memories. Research suggests however that this is a myth and that a photograph or a voice is just as likely to evoke a memory as a smell. Perhaps the reason for this myth is because smells, as opposed to sights and sounds, are very difficult to give a name to. The fact that smell is invisible, and thus somehow more mysterious, may partly explain its reputation as our most emotional sense.
What is the use of "aroma box" at Heathrow airport？

A. It can send a lot of synthetic fragrance into the environment.
B. It is an air conditioner blowing with fresh air.
C. It often pumps the smell of freshly-cut grass from a high-street shop.
D. It is a box which sends out not only aroma but also music.