题目内容：
Questionsarebasedonthefollowingpassage.
Inrecentyearsmanycountriesoftheworldhavebeenfacedwiththeproblemofhowtomaketheirworkersmoreproductive．Someexpertsclaimtheansweristomakejobsmorevaried．Butdomorevariedjobsleadtogreaterproductivity?Thereisevidencetosuggestthatwhilevarietycerlainlymakestheworkers'lifemoreenjoyable,itdoesnotactuallymakehimworkharder．Asfarasincreasingproductivityisconcerned,thevarietyisnotanimportantfactor.
Otherexpertsfeelthatgivingtheworkerfreedomtodohisjobinhisownwayisimportantandthereisnodoubtthatthisistrue．Theproblemisthatthiskindoffreedomcannoteasilybegiveninthemodernfactorywithitscomplicatedmachinerywhichmustbeusedinafixedway．Thuswhilefreedomofchoicemaybeimportant,thereisusuallyverylittlethatcanbedonetocreateit．Anotherimportantconsiderationishowmucheachworkercontributestotheproductheismaking．Inmostfactoriestheworkerseesonlyonesmallpartoftheproduct．Somecarfactoriesarenowexperimentingwithhavingmanysmallproductionlinesratherthanonelargeone,sothateachworkercontributesmoretotheproductionofthecarsonhisline．Itwouldseemthatnotonlyisthedegreeofworkers'contributionanimportantfactor,therefore,butitisalsoonewecandosomethingabout.
Towhatextentmoremoneyledtogreaterproductivity?Theworkersthemselvescertainlythinkthisisimportant．Butperhapstheywantmoremoneyonlybecausetheworktheydoissoboring．Moneyjustletsthemenjoytheirsparetimemore．Asimilarargumentmayexplaindemandsforshorterworkinghours．Perhapsifwesucceedinmakingtheirjobsmoreinteresting,theywillneitherwantmoremoney,norwillshorterworkinghoursbesoimportanttothem.
Whichofthesepossiblefactorsleadingtogreaterproductivityisnottrue? A．Tomakejobsmorevaried.
B．Togivetheworkerfreedomtodohisjobinhisownway.
C．Degreeofworkcontribution.
D．Demandsforlongerworkinghours.
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