【单选题】
A <{p}>Heisworriedaboutthewastewater
recycling.<{br/}><{!--[endif]--}><{/p}>
B <{p}>Heisworriedaboutthepriceofthetiny
engines.<{br/}><{!--[endif]--}><{/p}>
C <{p}>Heisworriedaboutpeopleinareas
lackingwater.<{br/}><{!--[endif]--}><{/p}>
D <{p}>Heisworriedaboutthepollutantsin
wastewater.<{br/}><{!--[endif]--}><{/p}>
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