题目内容：
根据以下材料，回答题 TheTricksofSupermarkets
Youmayhavewonderedwhythesupermarketsareallthesame．Itisnotbecausethe
companiesthatoperatethemlackimagination．Itisbecausetheyallaimatpersuadingpeopletobuythings.
Inthesupermarket,ittakesawhileforthemindtogetintoashoppingmode．Thisiswhytheareaimmediatelyinsidetheentranceisknownasthe"decompressionzone"．Peopleneedtoslowdownandlookaround,eveniftheyareregulars．Insalestermsthisareaisbitofaloss,soittendstobeusedmoreforpromotion.
Immediatelyinsidethefirstthingshoppersmaycometoisthefreshfruitandvegetablessection．Forshoppers,thismakesnosense．Fruitandvegetablescanbeeasilydamaged,sotheyshouldbeboughtattheend,notthebeginning,ofashoppingtrip．Butwhatisatworkhere?Itturnsoutthatselectinggoodfreshfoodisawaytostartshopping,anditmakespeoplefeellessguiltyaboutreachingfortheunhealthystufflateron.
Shoppersalreadyknowthateverydayitems,likemilk,areinvariablyplacedtowardsthebackofastoretoprovidemoreopportunitiestotemptcustomers．Butsupermarketsknowshoppersknowthis,sotheyuseothertricks,likeplacingpopularitemshalfwayalongasectionsothatpeoplehavetowalkallalongtheaislelookingforthem．Theideaistoboost"dwelltime":thelengthoftimepeoplespendinastore.
Traditionallyretailersmeasure"football",asthenumberofpeopleenteringastoreisknown,butthosenumberssaynothingaboutwherepeoplegoandhowlongtheyspendthere．Butnowadays,apieceoftechnologycanfillthegap:themobilephone．PathIntelligence,aBritishcompanytrackedpeople'sphonesatGunwharfQuays,alargeretailercentreinPortsmouth--notbymonitoringcalls,butbyplottingthepositionsofhandsetsastheytransmitautomaticallytocellularnetworks．Itfoundthatwhendwelltimeroseby1%,salesroseby1.3%.
Suchtechniquesareincreasinglypopularbecauseofadeepeningunderstandingabouthowshoppersmakechoices．Peopletellmarketresearchersthattheymakerationaldecisionsaboutwhattobuy,consideringthingslikeprice,selectionorconvenience．Butsubconsciousforces,involvingemotionandmemories,areclearlyalsoatwork.
InParagraph2,"decompressionzone"istheareameantto__________. A．prepareshoppersforthemoodofbuying
B．offershoppersaplacetohavearest
C．encourageshopperstotrynewproducts
D．provideshopperswithdiscountinformation
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