下列词语中加点的字，每对读音都不相同的一组是（  ）(3分)                       

A．松柏／柏油　　攒射/万头攒动　　数见不鲜／寡廉鲜耻　半身不遂/称心遂愿

B．伛偻／佝偻　嚼舌/咬文嚼字　方兴未艾/期期艾艾　箪食壶浆/食古不化

C．幽咽／下咽　　泥沙/拘泥固执　　应有尽有/应运而生　　大腹便便／便宜从事

D．关卡／卡壳　　量杯／量体裁衣　家给人足／补充给养　　畜养牲口／六畜兴旺

The parents had to sell their car for money ______ they wanted to save their child's life. [ ]

A. if

B. whether

C. because

D. so