题目内容：
根据以下材料回答题 Therearestockmarkets(股票市场)inlargecitiesinmanycountries．Thestockexchangeisaplacewherepeoplecanbuyorsellsharesofafactoryorcompany．Andeachsharemeanscertainownershipofafactoryorcompany．
Differentpeoplegotostockmarkets．Somearerich,whowanttogetmoremoneythantheyhave．Othersarenotveryrich,whobuystockstotrytobecomerich．Stillothersbuystocksaspartoftheirplantosavemoney．
Ofcourse,investing(投资)moneyinthestockmarketisnotthesafestwaytomakemoney．
Noonecantellexactlywhethertheshareswillbedoingwell．Thefactoryorcompanymaydobad-ly．Thenthestockswillgodown,andtheinvestorswilllosemoney．Thestockmaygoupordownforanumberofuntoldreasons．Everyonewantsthestocktogoup,butsometimesevenifafactoryorcompanydoesagoodjob,thestockmaystillgodown．
Nowondergoingtothestockmarketisoftencomparedtogambling(赌博)．Factoriesandcompaniesthatneedmoneyarepleasedthatsomanypeoplearewillingto"gamble"．Indeed,thestockmarketisanattractiveandcomplexpartofthebusinessworld．
Ifyouareagoodinvestor,__________inthestockmarket． A．youcanalwaysmakemoney
B．youcantellexactlywhenthestockgoesupordown
C．youmaysometimeslosemoney
D．yourgamblingisalwayssafe
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