题目内容：
根据以下材料，回答题Fiveyearsago,DavidSmithworeanexpensivesuittoworkeveryday."Iwasaclothesad-dict,"hejokes,"IusedtocarryafreshsuittoworkwithmesoIcouldchangeifmyclothesgotwrinkled."
TodayDavidwearscasualclothes--khakipantsandasportsshirt-totheoffice.Hehardlyeverwearsanecktie."I'mworkingharderthanever,"Davidsays,"andIneedtofeelcomfortable."
Moreandmorecompaniesareallowingtheirofficeworkerstowearcasualclothestowork.IntheUnitedStates,thechangesfromformaltocasualofficewearhavebeenslow.Intheearly1990s,
manycompaniesallowedtheirworkerstowearcasualclothesonFriday(hutonlyonFri-day).Thisbecameknownas"dress-downFriday"or"casualFriday"."Whatstartedoutasanex-traone-day-a-weekbenefitforworkershasreallybecomeaneverydaything."saidbusinessadviser
MaislyJones.
Whyhavesomanycompaniesstartedallowingtheirworkerstowearcasualclothes?Onerea-sonisthatit'seasierforacompanytoattractnewworkersifithasacasualdresscode."Alotofyoungpeopledon'twanttodressupforwork,saystheownerofasoftwarecompany,soitshardto
hirepeopleifyouhaveaconservativedresscode."Anotherreasonisthatpeopleseemhappierandmoreproductivewhentheyarewearingcomfortableclothes.InastudymadebyLeviStraussand
Company,85percentofemployerssaidthatcasualdresshasasideeffectonwork.Supportersofcasualofficewearalsosaythatacasualdresscodehelpsthemsavemoney."Suitsareexpensive,if
youhavetowearoneeveryday,"onepersonsaid,"Forthesameamountofmoney,youcanbuyalotmorecasualclothes."
DavidSmithreferstohimselfashavingbeen"aclothesaddict"because______ A．heoftenworekhakipantsandasportsshirt
B．hecouldn'tstandacleanappearance
C．hewantedhisclothestolooktidyandcleanallthetime
D．hedidn'twanttospendmuchmoneyonclothes
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